I had a baby 25 days ago i had unprotected sex but he pulled out before he cum should i worry ?

Maybe not: Usually for many women it takes about 6 weeks after a pregnancy before there is a chance to get pregnant again. But this is not always the case, for some women it is much less than 6 weeks. But it is unlikely you could get pregnant. But I would always advise protection (condoms) if you are not using birth control and always use protection against STDs. Pulling out is not a method of birth control