pregnant? period? HELP

How much bleeding did you have during pregnancy
I have had 6 "periods" since I last had sex in February. Could I still bleed every month at the time of my period, normal flow on time (sometimes early) goes for 5 days and on the pill and be pregnant? 
Symptoms: sore boobs that stop when I get my period, low abdominal pain that feels like period pain everyday for 17 weeks now. 
I had a pelvic MRI and they didn't saying anything in the report that I was pregnant? 
Should I take that as I'm deffs not pregnant?

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