precum through underwear?

There is nothing you should be stressing about. There is no chance you can get pregnant like that. I mean, getting pregnant by pre cum has became more of a myth than a hard solid fact. So I think you should relax. Only way you can get pregnant is if he penetrates inside of you and  then ejaculates, any other way is borderline impossible because sperm dies when in contact with air. Hope this helps.

Can I be pregnant if me and my boyfriend had dry sex? Me and my boyfriend had underwear on. Please help!

You are in the clear as far as him impregnating you. What sometimes happens though is the boy and girl will be on a beach, wearing just bathing suits. During cuddling, the boy’s penis will become erect in his speedos and the friction of cuddling will become more intense. Since the girl and boy are facing each other, it is very common for the boy’s boner to start nudging the girl’s bikini bottom. The feeling of his hard penis will naturally make the girl sexually aroused. Her vaginia will start lubricating and her labia (p***y lips) will get congested and swollen and eventually part. There will be a growing wet stain on her bikini from her sexual arousal, which is perfectly normal and natural. At this point, the head of the boy’s penis, although still within his speedo, will find the sweet spot between her labia and his head will lodge between them. The girl’s bottom will naturally react and she will start to squirm or may involuntarily start to gently thrust her hips into the boy. Movement between the two at this point is intensely pleasurably for both, as I’m sure you can understand. The boy will begin involuntarily thrusting into the girl. At this point, each is too aroused to stop - it simply feels too good. Unless an adult is there to interrupt them immediately, the boy’s precum will actually be steadily flowing from his penis and is usually enough to mix with the girl’s wetness on her bikini and make its way to her vagina. At this point, both are goners. Within 30-60 seconds, the boy will ejaculate his sperm through the speedo and through the fabric of the girl’s bikini and it will eater her vagina. Pregnancy may result.