Ok.... I have been using this forum so much lately because I think im obsessed!

So here is the story, I have a very regular 28 day cycle, yesterday, on day 12, I got a positive opk at 3:30pm. I work night shift and had to work at 7, but we squeezed in a bd at 6pm. I tested again today twice and my surge ended after 24 hours. We werent able to bd today because of work, so should we still try tomorrow? Dh sperm checked out normal and I am pretty sure I ovulate regularly, I noticed this afternoon I was very crampy and my nipples are slightly sensitive. So, my question is, since we bd yesterday, used preseed, orgasm was accomplished for both and I propped my hips up for 10 minutes afterward, did we do it too early? I know that I caught the beginning of my surge because I was testing 3 times a day.... see, OBSESSED!

is the first day of a 24 hour surge good? Could I be ovulating now since I have the cramping and sore nipples? Will not bd'ing today ruin our chances? Should we bd tomorrow?