Confused😬

I need some advice, so last week Friday, Saturday, and Sunday my fiancé and I had unprotected sex. We want a baby and Thursday was my first day of my "fertile window" I ovulated on Tuesday. My question is can I be pregnant? I'm getting tiny cramps but maybe it's just my mind playing tricks on me? Also I have to get a MRI done on my back and wrist Monday will that affect the pregnancy if I am pregnant? I also took a week worth of fertility pills to better our chances I do NOT have any problem getting pregnant.