Three days late- negative test... confused

Hey ladies, so I know everyone is different but I have a 28 to 29 day cycle. I always spot the day before my cycle. I started spotting the day before then the next day and it never got heavier and stopped. Now a little back story. This cycle I decided to stop trying. I stopped taking letrozol and only had sex once on cycle day 12. All my past cycles I’ve gotten a positive OPK on cd 14 then ovulated a day or so later. Well I didn’t check because we were not trying (kind of). On CD 17 I had some weird cramping so I decided to test with OPK. The whole rest of the cycle ( which was supposed to end 2 days ago) I had what looked like to me positive OPK. I went to dr and they did progesterone test and it was high. They said it is possible I ovulated late. Well here I am now on cycle day 30 and no more spotting and negative test. I’m going to dr to get blood work, but I wanted to see if anyone else had an experience like this and what the outcome was? Thanks for your help.