Strange period

Hey guys! So starting a few weeks ago, my fiance and I decided we were going to try for a baby. We started right away, and turns out the day we decided it was also the start of my ovulation days...

I think I just had my period, but I'm not entirely sure...

It came around day 29 when it's normally 32 to 34. It was very light that I couldn't use a tampon. And it lasted about 2 days, I had some cramps and my uterus felt, like tight, I can't explain it. So I'm not sure if it was a period or something else.

Has this happened to anyone else?