Did you moms know you were pregnant

The second time around

Obviously missed period but did you ever think like instantly you were pregnant for some reason? Iv been having such crazy dreams and I havent had dreams like this since I was pregnant. My bf and j just had sex a few days ago and I’m wondering if it could be the earliest sign pf pregnancy I’m probably not I’m just crazy but sometimes the human body and brain can surprise you. Like during the fertilization or implantation process what If it all clicks