I used it also and I still got stretch marks. But they say after pregnancy, if you use bio oil it's really helps repair your skin and helps with appearance
I am religioustillubbed myself from 8 weeks of pregnancy. All over my sides, belly, legs, ect. And I still got stretch marks :/ just depends on your skin I guess.
It doesn't affect the baby..
I also uses bio oil but stopped using it I heard it can affect the baby who knows I just heard ima use it once my baby's out just to be on the safe side
I used it the whole way through my pregnancy and didnt get any stretch marks! My baby is now 5 weeks old and apart from being a bit "loose" around my belly you wouldn't be able to tell I had her! I was lucky I didn't get any but I think it was because I used bio oil every night after the shower so my skin was always soft