My gf being bloated 1 week after oral sex up to 3 weeks until now, she gave me a oral then we kissed after that i went to her private part then licked it, i am very worried if i had a pre-cum in my mouth or lips, is this a sign of pregnancy?

You asked this question before, chance of pregnancy is almost none. Furthermore, bloating is not an early pregnancy symptom. To erase your doubt, do a pregnancy test with an early morning sample if she misses her period more than 5 days and that sexual act 3 weeks ago was the last one, pregnancy test should be positive by now.

For pregnancy to occur sperm has to enter the vagina during ovulation, If she's quite regular with 28 day cycles, ovulation occurs around day 14 but this is just a guideline. I doubt transfer of sperm from your mouth into her vagina, but if she misses her period, do a pregnancy test about 4 days later.