Hi there... I just saw your post, and thought I'd reply... don't know if I'd be any help though!...
I was diagnosed with PCOS a while back... can't remember when exactly, and a friend of mine was diagnosed as well.... and in response to your questions...
1) I still have what you could call regular periods, but my cycle length varies from month to month, and sometimes I don't come on at all... My friend does have regular periods, but she is on the pill, which obviously regulates your cycle... I am allergic to both the pill and mini pill, so I just have to grin and bare it!
2) Since I started my periods, they have either been irregular to a degree, or so painful that I would sometimes pass out... pain killers didn't seem to work very well either... I have a few 'symptoms' of PCOS, if that is what you can call them - including the fact that no matter what attempt at dieting I try, I always seem to be the only person I know who has to try harder than everyone else, because the extra pounds just don't seem to want to shift!!! Not that I am over weight.... it would just be nice to tone up with the minimum amount of effort instead of maximum!
3) I think it would depend on the severity of your PCOS, and also any other under-lying points. I got pregnant a few years ago, but I miscarried quite early, however a friend of mine was pregnant, and her daughter is now nearly 5, so I think that it is possible, but just depends on each individual and the seriousness of your condition.
Hope that helped?
