My gf had periods on 15th of may, after that on 1st june i penetrated her a bit but because of her pain we stopped and applied some oil tired again but didn't it. after 10 days she had vomits,gas,frequent urine. is she pregnant or its just her pms?

If her symptoms are related to hormones of pregnancy, there would be enough to turn a urine pregnancy test positive. The symptoms by themselves are found in many conditions and an evaluation & testing would sort out a cause. Starting with a simple home pregnancy test may be reasonable. If negative, it is something else.

Conception occurs within day or so of the sex. It takes about 3 weeks for the embryo to make enough HCG for a positive pregnancy test. Blood test may be done a day after a missed period. Home pregnancy tests should be done 4-5 days after the missed period. If the result is negative repeat the test in 4-5 days. Use first morning urine and follow instructions for the test carefully.

If you did not ejaculate then no pregnancy