Cramping/spotting.

It's 5days until my period starts then today i started to feel some cramping and when i wiped i noticed a little brownish/red color on the paper. The last time my husband and i had unprotected sex was the 16th then the 21st which was the last day of my fertile window. Could this be an early period or something else. I'm really gassy/bloated and emotional which are pms symptoms as well. I had an iud removed in may and my cycles have been pretty regular give a day or two here or there.