Pregnant on birth control

I’m not sure what group to post this in, however I’m just wondering if any of you ladies have gotten pregnant on birth control and have had a withdrawal period. I’m on the pill along with sprinactalone ( however you spell it ) for PCOS,not to prevent pregnancy. However I will admit I’m very forgetful about taking my pills. I have never been good at remembering and I plan to test tomorrow, I was just wondering if you still get the withdrawal bleed if you have gotten pregnant (no I’m not currently bleeding), thank you in advance.