My periods are late. they ended on december 31st and i didn't get them in january. me and my boyfriend did not have sex, but he rubbed his penis against my vagina. he didn't cum. should i worry about getting pregnant?

You are 16 years old: ; have unprotected sexual activity. That is concerning. The chance of pregnancy is not very high if this scenario is accurate. However, if his penis did enter your vagina or was rubbing against the tissues at the opening of the vagina then it is possible that sperm could be deposited. Even without ejaculation - pre-ejaculate can contain sperm. At this point i would take a pregnancy test. Any.

Pregnant: You probably are not pregnant but for peace of mind purchase a pregnancy test to allay your fears.

Dear Germany: While common place, sex, is not the best that you can do for your relationship. Worrying or harming yourself is not something i would suggest you do. Sexual play without any commitment brings risk of changing your entire future. Be careful not to make such powerful life altering choices when you are so young. Love yourself/him enough to say not yet. If true love, he will wait, and so will you.