I'm on cycle 2 of ttc. The first cycle I got a very strong positive OPK a day or so before I ovulated. I took an opk last night and it was very almost positive, the line was the darkest it's been this cycle. However I took another one this afternoon and the line was back to being quite faint again. Is it possible that my surge happened overnight and I missed it? I had some mild cramping in my left side for a few hours this morning (I had similar cramps in my right side around ovulation last cycle) so could I have ovulated today? We dtd Saturday, Sunday, yesterday and today and will be dtd again tomorrow so do you think that if I did ovulate today and just missed my surge on the opk that we've dtd enough?