Just curious, it's my first month temping/using opk's, so I'm not 100% certain of my luteal phase

How many days post implantation cramps did you get your BFP?

I had pinching/pulling twinges off and on the past 2 days, 7 DPO & 8 DPO, just wondering, if it was implantation cramps I was feeling (too early for AF), when could I expect a BFP?

thanks!