Could i be pregnant?

The other day my boyfriend and i had sex and when we were done we noticed that the condom was on weird and no cum was in it. I didnt feel him cum in me but he said he came. I've been cramping for 3 or 4 days now. I have a cold and i usually never get sick. The other day i had lightly spotted when i wiped but haven't seen it anymore.  I hope I'm pregnant ! What would the chances be?? Please help!