I didn’t experience implantation bleeding with mybfirst and had a MC in Dec. 2017 so my cycles have been too irregular to chart with OPK. I’m totally optimistic BUT I did experience some dark brown spotting 2 days ago (right after a vigorous workout) but only one time. Yesterday I noticed light pink spotting on my liner but after I changed it, I didn’t see anything rest of day. So far today, nothing. Last (probable) cycle ended around 3/23 and I don’t know the last time I ovulated.
What was your experience with implantation bleeding? Could this be? Also feeling fatigued and some harder bowel movements (which is not likely for me since I have crohns).

Thanks!