Hi there, I'm not sure about the LH phase bit but I just wanted to let you know. I used an opk on a Monday, it was negative, used again on Tuesday it was positive so we BD'd that night. Opk was negative on both Wednesday and Thursday but I got my BFP 2 weeks later.
I think it's fine to have a positive OPK one day and negative the next. I'm not sure if that would be considered a short surge, but I don't know how much that really matters. If you had the surge which lead to ovulation, that's all that matters! What I hear most re: when you ovulate after a positive OPK is 24-48 hours. So based on a positive OPK on CD 13, you probably ovulated on CD14 or 15. I don't know if you temp, but that can help confirm ovulation after the fact.
What kind of opk did u take? Maybe ut looked positive but wasn't actually there yet.some ppl do get positive day and negative the next it depends on your cycle and when u start testing i start early so i can see my line getting darker.
Hey Ladies
I have only had 1 positive result and only on 1 day. I read it's ok and pretty normal to get it for 1 day. As long as you get it you should be all good.
These tests are so hard as drinking too much, peeing too often and taking the tests too early in the day can change the results quite a bit.
Keep trying and you'll get there