Conceiving with a broken body.

Hi all.

This is my first ever post here. I'm going to jump right in because I am completely lost on what to do. So 3 years ago, my GYN told me that I should start on BC because I have PCOS and my periods are 100% irregular (like maybe 1 a year). We weren't at the point where I was dying to start a family, so I wasn't so concerned. Flash forward and now we are ready. I started Sprintec BC tabs last June and have been having monthly periods. I was told by my GYN that when we are ready to try, to have my period, and monitor when ovulate. So I have been doing that here. However, lately as soon as my period is over, I stay off BC and wait until ovulation but sometimes (and more regularly than not) I start up a lesser version of my period and go another 5ish days of it. What do I do? If I'm following BC rules and staying off to TTC, what's going on? I ovulated on the 13th (not on BC) and today, BAM! Period. This is 2 times already this month. I've only had about a week break from having a period. I'm not sure what to do anymore. Conceiving was a worrysome thing anyway as my sister has PCOS as well and had to do IVF. They say my PCOS is not so bad I cannot conceive on my own right now, but the way my body is going, I'm not sure how that's possible. Any ideas or advice? I will be calling my DR tomorrow as well..just wondering if anyone else has gone through this. Thanks!