Worried bout being preg by precum but have had 2 period since i'm waiting for my next period but it's 5 days late shld i worry? i gained 10lb as well

Unprotected?: If you were not protected with BC or condoms- yes it is possible. Get a pregnancy test and consider double contraception.

Take a test: It is possible to become pregnant from pre ejaculate. however since you have had 2 assumingly normal periods, and providing you have abstained or used protection since then , it is unlikely. But to be safe. Take a test!!!!