Implantation bleeding?

8 days before my expected period I started cramping with very light spotting. Day 2 still cramps a little heavier bleeding (2 tampons). Day 3 light spotting then ended early in the day and I also had a bad headache which isn't normal for me. Today (day 4) no bleeding just some cramping. My SO and I had unprotected sex during ovulation multiple times. I feel it's too early to test yet but idk. We aren't really trying to conceive but if we were too we would still be happy.