If a man pulls out to cum but then inserts it back in, can i still get pregnant?

Certainly. An erect penis is secreting sperm containing semen constantly. It only takes one to trigger pregnancy. The "main load" just has a higher concentration. If you keep this up expect to get pregnant. If you want to avoid pregnancy use a dependable form of birth control.

If this happened less than 72 hours ago and you want to prevent pregnancy, take emergency contraceptive, Plan B, You are at risk of pregnancy and STDs. If you miss your period by 4-5 days, do a home pregnancy test. If the result is negative repeat the test 4-5 days later unless you get a period by then. Use first morning urine and follow the instructions carefully. Wish you good health!