Has anyone been wrongly diagnosed with PCOS???

Hey Ladies, I'm 24 and was diagnosed with PCOS about 2 years ago, due to the fact that my periods had become very irregular, I have no other symtoms really, apart from a acne now and again and I do suffer quite a lot from stomac aches but haven't had that for a while. I'm 5ft and I weight 8 stone so I'm not over weight. About 2 and a half months ago, I came off the pill and became pregnant straight away, when I had my first scan the midwife said my ovaries looked fine, sadly I had a misscarriage almost 2 months ago, which was my first pregnancy. However, I had my first period literally a month after, which is the first natural period I've had in ages, so you think they could have got it wrong?