PCOS or period?! Please help I think I might be pregnant !

So I have a pretty regular cycle normally however I was diagnosed with PCOS at a young age due to complications with ruptured cysts. I normally have heavy and semi long periods, however I noticed in the beginning of March that something was wrong with my cycle. I normally have a 27 day cycle. However since January my cycle has been way off I went from January 13th till March 8th before getting any bleeding. And I had a sharp pain one day of semi- heavy bleeding and only spotting following until march 13th. I had sex unprotected on January 18th. I took the morning after pill but I am on topramax which is a migraine/anti-seizure medicine that interacts with all forms of hormonal birth control. So I am worried that the morning after pill did not work. I have had a lot of nausea, but no vomiting. More frequent urination, bleeding gums, I have also noticed my bra cup size go up from a 42 C to a 42 D and my breast are very tender and sensitive. This is not my first pregnancy however my first one ended in a miscarriage and I notice a lot of similar symptoms as I had with that pregnancy. Please help!