Is this menstrual blood?

Very odd cycle: CD13 opk+ likely ovulated on CD15– spotted a few days now this bleeding on CD18!?

Last cycle I was on progesterone which pushed back my period about 9 days so if this is weird body memory this would be when my next period would have been if I hadn’t been on the suppositories.

I also usually ovulated closer to CD17 so this month was super off.

I had lots of anxiety/stress in the last few weeks plus just wrapped up a course of antibiotics for an ear infection.

Could those have messed with my cycle and caused early menstruation?

This is going to throw off my entire August IUI cycle.