Hi everyone. We are TTC #2. My periods are generally around 28-30 days long - last one started properly on 27 April.
I had a positive OPK (I think?!) on CD15. We DTD CDs 12, 13, 14, 15 and 17, so really felt like I was in with a shot this month!
Yesterday when I woke I had very very mild crampy/period pains on and off most of the day (very mild though - doubt I’d even notice them if I wasn’t obsessively thinking about it
) and in the early afternoon after going for a wee, I wiped and there was some pinky brown discharge (sorry if TMI). Nothing for the rest of the day and then a little more this morning. I also had a twingy pain on my left side.
At first I thought perhaps to do with implantation but I also had a bad headache yesterday, which I tend to get around AF. Still slightly crampy this morning.
I think most likely it’s AF coming on but why so early?
Just my body messing with my mind and proving once again that we have no control over TTC? And what does that mean for the positive OPK? Is it possible I ovulated but just practically immediately went into AF?
I know OPKs aren’t foolproof - I might start temping next cycle. Which looks to be starting sooner than I’d like 
Any advice or experiences? Thank you