anal sex, birth control, pregnant

So thanks to my fear of pregnancy I decided to try anal sex. (no condom stupid I know)
It was wonderful of course but now I'm terrified of being pregnant.

I'm on birth control and I've already had my period (my periods have been getting lighter, so this light period that lasted for 3 days didn't concern me).
However, lately, when I sit down for a long period of time I feel like a tingling in my urethra. It sometimes like a strong need to use the bathroom.

Is this just a symptom of another UTI (I get them frequently) or is this a concern for pregnancy?

thank you.

I know this question was posted last year, however, I feel the need to reply.

Being careful is good... but you sound neurotic. You're on birth control and you've had your period after sex. You're not pregnant.

If you're taking your birth control on schedule, your chances of getting pregnant from vaginal intercourse are next to null... Your chances of getting diseases are significantly greater...

You need to concentrate less on pregnancy and more on your own physical and mental health.