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Heather Corinna replies:
Just so that this is clear, for you and plenty of other people who have been in the same spot, here is what anal sex is and is NOT:
If you're going to engage in anal sex, you have got to be using a condom, and it really is that simple. Should you and your partner have already had six months of sex with latex barriers consistently, six months of sexual monogamy AND at least two full and clear STI tests in that period of time, then while bacterial infection risks still exist, other STI risks are decreased. However, if you're not using another method of birth control, pregnancy risks may still exist.
If your periods are not yet regular, then it's possible you're just dealing with some irregularity. However, since you did engage in an activity with a pregnancy risk, and your period is late, I'd suggest you take a pregnancy test now. In the case you did become pregnant, that's something you need to know as soon as possible so that you have time to fully consider all of your options and make whatever decision is best for you. You'll also want to schedule a full STI screening in about a month for yourself (and your partner should have one, too).
For future reference, if you had this sex with a regular male partner, I'd suggest having a talk to make clear that unprotected sex isn't okay for you to do until you're ready to be pregnant, and he's ready for you to be pregnant as well. I'd make clear this presents STI and pregnancy risks, and that if you both do still want to do it because it's something you enjoy, then you need to get set up to be doing it safely, okay?
Just so you have these for your reference: