Withdrawal 3 days before fertile window

I had unprotected sex 4 days before my fertile window starts, on day 9. My cycle is on average 31 days, and will usually ovulate on day 17.

My partner withdrew extremely early, and I had sex again on day 13 of cycle, protected using a condom. It is the first day of my fertile window. The next day (day 14), I went to the toilet and saw blood tinged mucus when I wiped. The blood is only a spot, and it doesn’t stain my panties. It was only a one time thing.

I felt cramps, and I’m not sure whether this can be implantation bleeding or ovulation cramps. Or could it be cervical trauma from sex?

There is still no signs of ovulation (cm and cervix check).