Bd day before and day of a positive OPK

My first time using opks my cycles range from 28-32 days so I thought I ovulated later however looking at these tests I'm wondering if I've had trouble getting pregnant because of this timing difference. My first opk on CD 12 was negative but we BD the next day on CD 13. On CD14 I did another opk and the line was darker then the control we BD again that night. Yesterday and today's OPKs are fainter making me believe I ovulated CD13 or 14. Just wondering if anyone conceived with having sex the day before and day of a positive opk? I just can't stop obbsessing. I had mc two years ago and haven't gotten pregnant since. Any input would be so lovely !