If your girlfriend's first day of her last period was the 24th of march, when can she get pregnant?

she had sex April 3 and then april 11th, which time would get her pregnant?

It depends on how long her periods are. It can be as short as 3 days to as long as 18 days, in some cases even shorter and longer than those! I'd say chances are her period doesn't last for 10 days, so she probably could have gotten pregnant on either April 3rd or April 11th.

14 days from the first day she begin her period just count

my 14th day was on the 21st of july n had unprotected sex bt pulled out on the early morning of the 24th. am I gonna be pregnant?

look it up online it will give a promising anwser but to be honest id juss call an O.B.G.Y.N

Buy the kit. Uprotected sex is baby making any time. Get her on the pill, shots, or norplant.