I'm 18 years old and my doctor switched my birth control a few months ago. The first two packs I went through everything was normal my period was during my placebo week and stopped a few pills into the new pack. I am sexually active with my boyfriend and we rely on the pills for our birth control, he also pulls out most of the time but lately he hasn't been. I am in the second week of a new pack of pills and started spotting a few days ago but it has started to get a little heavier. Is there any way that I could be pregnant and experiencing "implantation bleeding"? I've heard so many different things. ( I have also not been the best at taking my pills at the same time everyday and so miss days every once in a while and have to double up.)