Quoting Chelsea Dawn Moore:" how likely is it to get pregnant again four weeks after having a baby...and having a normal period?"If you have sex it's likely. After you have a baby you are EXTREMELY fertile and more than likely to conceive again of you have unprotected sex. SIL had a baby and exactly 6 weeks later was pregnant again, so she would've had sex on the 4th PP week. Now she has two kids who are pretty much just over a year old.