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I'm pretty sure you would stick to EOD until you get peak, because peak is the equivalent of a positive OPK.

that said I think one extra day more or less doesn't make that much difference, as long as you make sure to BD when you get that peak/+!

I messed up last time using OPK and used FMU. I think the key is to use late afternoon urine. I ended up getting all high and no peak. Annoying.

@NorCalWayfarer: I should probably warn you that when I was using the CBE fertility monitor in 2011 (which I am pretty sure worked the same way? this is just a new smaller version?) I got between 4-8 days of high before peak. no way we could do 10 days of BD without getting sick of it

that said I was on clomid which I think can mess with those high readings.

as far as the FMU thing - I don't have advice but I will tell you that I tested with my monitor with FMU and did OPKs in the afternoon (because I am crazy). sometimes I got OPK+ and peak on the same day, sometimes I got OPK+ the afternoon before and a peak the next morning. you could get some cheapies and test the other time of day if you are worried about missing the surge.

No advice for you, friend. I used regular CB opks. I have found that I O pretty regularly so when that expected date comes around (approx. CD 12 or 13) I use the OPKs twice a day. Otherwise, I always use them in the afternoon. I don't really know if there is a perfect time. I've had a positive at 11 pm and a positive at 8 am.

I, too, am trying SMEP. Although I didn't start yesterday, CD8.... I nearly had a melt down thinking about starting one day off. But what can I do about it now?

@NorCalWayfarer: crap, I just read the instructions. FMU

@NorCalWayfarer: You seem so much more relaxed about it than me. I am actually really embarassed about the display of emotion I put out when realizing that "we" were too tired to BD last night and would miss CD8. Who cares if we need to get up at 4:30 am and its already 1030 pm???? But in the light of day, all situations look a little less life-altering. You are right about CD10 being more key than CD8. You are smart, friend.

I think I posted about this on several other boards but always happy to share my experiences with OPKs and TTC if it can help in any way.

I used cheap wondfos everyday of my cycle, twice a day, AM and PM. When I noticed the lines were very similar in darkness, I would use the CBE smiley digital OPK to confirm (CBE Advanced). I think I literally missed one day of using the CBE and the next day, it was a solid smiley (not flashing) which meant peak fertility. I tested at night when the solid smiley came up, but I was too tired to BD and went to bed. I tested the next morning with a wondfo and my test line was already looking lighter (BTW you can't use the CBE OPK once it becomes a solid smiley for at least the next two days, think it's to serve as a reminder that you should be BD'ing and not testing). Since it was morning and we had work, we skipped BD again, but finally got to later in the evening. We BD'd on the following days: O-2, O, O+1 and O+2 (dates verified by OPKs and temping) and got pregnant that cycle, which was our first official month charting, using OPKs and taking temps. I think we got lucky because we were able to pinpoint O. Although we didn't go the SMEP (too much sex for us ), I think the SMEP ensures your bases are covered because you're DTD so often. I recommend using OPKs twice a day if it's not too much of a hassle. Don't worry if you see a solid smiley and you can't BD that moment or that day. Solid smiley means you WILL ovulate in the next day or two. Sooner the better though, and keep doing it! Best of luck!

@SupernovaJ: Hope you don't mind a question regarding your pregnancy, how important was BD for those days after O? My understanding is the sperm have a long way to travel and the egg is only around for minimal time so it's best to have sperm already up there to meet the egg once it's time. Which makes me think your BD on O-2 was what did the trick!

@mrskoloa: That explanation makes sense to me! I'm going to use my previous cycles and FF to make an accurate guess on most fertile days! Hoping that works just as well as OPK's.

@mrskoloa: Maybe I had a defective OPK but I googled it and read that once the solid smiley shows up, it's on the screen for two days. I remember thinking the smiley looked so creepy because it was always there. I don't know if it's true but I also read that you only get one positive OPK "read" per cycle, so the fact that it didn't reset the next day does make sense. But take my experience with a grain of salt, I never did in depth research on what's supposed to happen with the OPK in the days following the solid smiley. I just put mine away after a day or two and it finally went blank. Good luck!

@mrskoloa: huh, I did not realize that. I wonder why my OB said every other day for sperm quality.

@NorCalWayfarer: yay!! Good luck!!

@SupernovaJ: hahahhaha I was wondering any the smiley was still on the screen