My partner may have pre-cum during intercourse and i have thrown up.friends say its because of stress and worrying i might be pregnant is it possible?

Withdrawal Method: It is well known that pre-cum, or the withdrawal method of birth control leads to pregnancy. You very well may not be pregnant. But, precum can lead to insemination and thus pregnancy.

Risk: Pre-ejaculate may contain large amounts of viable sperm (less common), smaller amounts of sperm that are dead or alive or no sperm. Thus, there is potential for pregnancy with pre-ejaculate. Sperm need to be deposited in the vagina or at the introitus for pregnancy to occur. Use protection every time you have sex if your are not ready for pregnancy. Take a pregnancy test if your period is late.