There are plenty of women that go on to have happy and healthy pregnancies with PCOS. Don't be discouraged sweetie.
It "could" take you longer, and I will advise you to drink plenty of water, as Metformin is notorious for making your bowels loose. For some women, the adjustment is absolute torture.
Fingers crossed for you! Try to get some OPKs so you know when you are ovulating. I know for some with PCOS it doesn't really work, but you won't know where you fall in that category until you try. $20 bucks for a pack of 50 and 20 prego tests, can't really go wrong. Just use one every day in the afternoon/evening.
Hang in there sweets! Maybe post something in the LTTTC board? Many women with PCOS there. (I had the diagnosis, but had a lap done 4x to drill and drain my ovaries and thanks to endometriosis, I am down to HALF an ovary... I had a cyst develop over the coarse of a couple of days that sent me to the hospital shortly after surgery 3, and they sent me for an mri, they had to dissect my ovary to get it off/out. I actually ovulate just about every month still, and after that 4th surgery, the ovary went dormant (and thanks to handy dandy lupron to give it a rest), it perked back up after 4 months and been TTC ever since.