My boyfriend and I are 18 and try our hardest to be smart about sex. We use condoms and he additionally pulls out, so that in itself is most likely enough. But we also check the condom after for rips by filling it up with water. We had sex about a week and a half ago 3x in 1 day during my fertile window and none of the condoms were broken. My period is supposed to come tomorrow but I don't really "feel" it yet (I can normally tell). I've also been crazy emotional and anxious for the past week and also been experiencing a lot of nausea and indigestion (mostly at night and I'm pretty sure the nausea is from stress. It's a normal stress response for me). I'm still a little bit freaked out though. Do I really have any reason to be worried about pregnancy?