Could I be pregnant?

My period came on August 3, I did an HSG on August 14 and I had sex August 17, 19 and 21. My period is usually an average of 29 days. On. I was put on doxycycline for 10 days after the HSG

Since late last week I've been having on and off pelvic cramps everyday. My breasts haven't changed and i haven't noticed anything different with my body apart from my uterus feeling like its about to tear out.