Pregnant while on the pill and take it same time every day. Is it possible?

Keith

I never skipped my pill. This week it started that i am constipated then two nights i woke up feeling nauseous i had diarrhea but it just let me p**p trice then it goes away now after two days of not having any nauseous feeling, diarrhea for an hours, but still constipated, i have a lower right back pain.