What is this?!

So, my cycles are usually a few days early or a few days late. Usually between 27-29 days, but I've had two cycles where they were 41/42 day cycles. Since then they have been 27-29.

I came off of the pill (both hormones) over a year ago, I think it'll be 2 years come this August. My partner and I are not trying, but also if I do fall pregnant, we would be excited. I'm not sure what's going on with my body, but below I posted a picture of my Glow calendar and when my next expected period was due, not for another 3 days. We did BD during my fertile window, just not on my peak day.

My question is, if this is a period, does this look normal? Can this be something other then my period? I barely am experiencing any cramping, but yesterday and the day before I did get some pretty uncomfortable cramps and was throwing up as soon as I was awake. This morning I also did vomit, but it calmed down.