Memory loss from pregnancy

Is memory loss common or normal? I was 14 when I conceived my son (gave birth) I am now almost 20 but I don’t remember much from my pregnancy or much about my son when he was a baby... I’m now pregnant with my second but don’t know what to expect?? it all feels new to me, but it isn’t I already have my oldest and I’ve raised him alone (with the help of my parents financially) why am I not able to remember much from my first pregnancy ??? Is this normal ? has anyone else experienced this ?