Spotting after sex during fertile window/steroids?

In case this is a factor, I was prescribed methylprednisolone following some dental work. I’ve taken the (5) pills as directed for the first day and the same night SO and I BD. I’m in my fertile window, according to my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period app</a> I’m 2 days away from ovulation. Anyway, I wiped down there after we were finished and there was light pink blood. I’ve never ever had spotting in between periods, and my periods are spot on and normal. And usually, I get these gas cramp like pains in my ovaries indicating ovulation. So, IF I’m not ovulating now, is the spotting normal? Could it be the steroid? If anyone had an experience with that drug please let me know 🙏🏼