Too early for menstrual cramps…

This cycle seems so messed up. So my husband and I had unprotected sex the day after my last period day… so the first day I wasn’t bleeding. We also had protected sex around the time I was due to ovulate. I don’t know for sure when I ovulated, I haven’t been temping, but my cycles are normally super regular at 28 days long.

Well today is only 5 or 6 dpo and I’ve been having very mild back cramps off and on all day. They feel kind of like menstrual cramps for me but much lighter, and I’m not due to start my period for another 9 days. I usually only get cramps the day before my period, or twinges during ovulation.

Could this just be a side effect post ovulation? Anyone have any ideas?