I had sex just before my ovulation, and expected periods came 1 month late. These periods have started since 1 month and not stopping, having started heavy bleeding now. I have very irregular periods and PCOS from 4-6 years. I had ultrasound 10 days before which showed everything normal with endometrial thickness 5mm and polycystic ovaries. Am I pregnant? Or is it hormonal imbalance? I am 22 years old n weight 33 kgs. I had pause mf for 8 days 16 tablets but no effect. What are the chances of pregnancy?