Is it too late?

My period is In 12 days. I think I may get a positive opk tomorrow or the next day. Is that too late to ovulate to get pregnant? I have a doc appointment on In 2 days to check if I have pcos. And I’m not even sure if I will ovulate, the line is dark but not as dark and the control line. Is that to late to ovulate to get pregnant before my period starts in 12 days??