Nicky, I'm so sorry! That's awful! Are you ok?
Mig, with pcos periods can be so off and the hormonal imbalances can cause many symptoms, such as fatigue. If you haven't missed a period I don't think you are but since it is a possibility act as of you are. Once a period is missed test to confirm, if the test is negative still act as if you are until you have a period or a positive test.
If your bleeding has soaked more than a pad, then you are not pregnant. I have PCOS too. I was 6 weeks preg, had sex last night first time after test confirmation, miscarried today! Am not pregy now.