Chances that I am pregnant???!

OK, I had my son about 16 months ago and began taking the mini pill 6 weeks after!. Ever since I started taking it my periods have been irregular, by this I mean that my cycle changes from month to month but has never been longer than 35 days (until now)!. I had a heavy period on march 5, and then had another heavy one on march 28 which lasted until about April 4th!. I havent had a period since then so I took a test (generic brand) about 30 days after my period and it was negative!. Still didn't start my period so i took another pregnancy test (first response "tells you five days before your missed period"), about a week later, and it came back negative as well!. I know that on the mini-pill your period can stop completly, but I thought that since I have been on it on so long without that happening it wouldn't!. Could I be pregnant and it's just not showing up on the test!? Or have I waited long enough to test so that if I was pregnant it would show!? PLZ HELP!Www@Answer-Health@Com

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