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i'm carrying one and my test line was ultra strong. I am not under the impression that darkness correlates to quantity of hormones, though. They're just a yes/no type of test. I believe it has more to do with how concentrated your urine is.

First, congrats on the bfp!!!

It's really hard to speculate on multiples until you have an ultrasound. I got my first bfp at 10 dpo and the line was still pretty light on a frer. My beta hcg blood tests at 14 and 16 dpo were on the high side though....around 250 and 630 I think. I have twins.

From what I've read, the darkness of the line has as much to do with the amount of dye in the particular test (which can vary test to test, box to box, etc) as your hcg levels. My lines definitely got darker over the first few days though, so I think in general, more hcg = a darker line, but it's not an absolute. Baby could also have implanted on the early side, or you may have ovulated sooner than you thought. You can always say you are unsure of your dates and push for an early dating u/s. My twins were clearly visible at 7w!

@Alivoo01: I'm glad I didn't freak you out with the story. I guess to me it makes sense that the unfortunate loss of a twin probably did occur a lot more frequently than doctors knew about because I think its just recently that they do ultrasounds 8 weeks and earlier.

My HGC draws came up high...4000 something at 17DPO and I only have one in there. The only way to know for sure if it's multiples is the ultrasound.
Good luck!

Congratulations! I don't have personal experience, but my GF with twins told me (and I recall it so vividly) that she had barely finished peeing on the stick and it had turned dark before she even was done! Good luck either way and a H&H 9 months to you!

No advice, just congrats! So happy for you!!

Congratulations!!

When i had my twins the line was crazy dark and instant but as others have posted I don't think it's something to base the likelyhood of twins on. Wait until your ultra sound to be excited/terrified about twins. I know easier said than done because everyday until then I am sure you will think about it. Congrats on your positive, that's so exciting.

My first line (at 11 or 12 DPO-can't remember now) was super, super faint, but I took like 10 in the following days because I was obsessed with making sure I was still pregnant. They definitely got progressively darker. While I had no clue about the twins until the ultrasound at 8 weeks, some things that could have been clues, though not guarantees, were that I started getting morning sickness really early and it became really severe and my tummy was growing faster than normal--in the first trimester I usually measured about two weeks ahead of where I was actually at. I also had super, duper crazy fatigue, but since I've never had a singleton, I can't really compare that.

I would definitely pay attention to how much your HCG level increases tomorrow and then just wait for your first ultrasound!