Birth control or pregnant?

So I’ve been on birth control since the 6th of May. I had un protected sex on the 13th, 17th and 19th but my bf only finished on the 19th. I’ve had my “period” or breakthrough bleeding regularly after for may and june, similar to my normal cycle 5/6 days with medium/large clots and cramping. However I’m in the middle of my pack now expecting my period the 26th and experiencing some odd symptoms. Gas, bloating, nausea if I get hungry, abdominal and pelvic pains and period like cramps. I’ve had a bad reaction to the pill before but not this seriously. Could someone help please.