I am 29 and I have had irregular periods for the last 6 months, before that i was a perfect 28 day cycle, no idea why they changed. they now run 5 weeks than 3 weeks, than 5 again. This month i was late and presumed another 5 week, I wanted to visit the doctors, so did a pregnancy test to rule it out before making an appointment. so to my surprise it instantly turned positive! we use the withdrawel method, which I know isn't 100%, but has always worked for us, I'm unsure as I've read this could be an ovarian cyst, please help