Alcohol before knowing you were pregnant.

Recently found out I’m 8 weeks pregnant . I had a miscarriage end of September and had one period. I got the vaccine in between. Took a digital test the day of my missed period 11/24 and it was negative. I took a test on 12/18 bfp, wasn’t expecting that. I have been taking prenatal, fertility supplements ti help get my cycle back and have been eating and drinking, I went on vacation prior to thanksgiving. I know they say the baby gets the nutrients from the yolk sac until the placenta attaches and I’m praying all is well this time. I question myself how could I not know I was pregnant but I didn’t have any of the same symptoms as the last time and I don’t feel pregnant.