✔ 最佳答案
the withdrawl method is very unsafe. there is such thing as pre-ejaculatory semen which means that even before he thinks he's finished and pulled out he's left some sperm in you from earlier. i think that you are really young and you have your whole life to get pregnant.
you're 16 which means your body is still changing and that could be the reason your period is late. stress could do it too. take a test and while you're there buy a pack of condoms. it'll be worth it when you get to graduate with all of your friends.
bloated-ness is more common a sign of your period than pregnancy. breast tenderness is a sign of both. just dont panic, take a test and see. but be more careful in the future.