My stupidity is leaving me puzzled

I forgot my birth control the 30th of June through the 2nd of July. Took it the 2nd and 3rd then forgot it again on the 4th. Then again Saturday the 8th. I took two pills yesterday for the 8th and 9th but before I was nauseous after I was really nauseous and severe cramping any ideas what why? I had unprotected sex a couple of times through out them days. Supposed to start in 6 days? Need advice.