Hello everyone...I need some advice, I am 25 years old and have been on birth control (the pill) for about 1 1/2 months. I have just recently noticed spotting , but I know that it may have to do with the birth control pill itself. My main concern is that along with the "pill" I have been taking a diet pill. Ever since the "pill" I have been gaining weight. I take the pill around 6 am and about an hour later I take the diet pill...so the question is, could the diet pill counteract the birth control pill? thanx for any replies.