Unhealthy lifestyle before knowing I was pregnant

I just found out I’m 8 weeks pregnant. It’s my first pregnancy and didn’t had much symptoms except for missed period. Prior to knowing I was pregnant, my lifestyle for the past 8 weeks was terrible. I drink, partied and smoke (not a heavy smoker) almost everyday. I’m also a sashimi lover. When I found out I was pregnant from a urine test, I immediately stopped all toxic lifestyle that could affect my child. However, I’m afraid it’s too late as I understand the first few months are the most crucial. Is there any test I should go through to check for deformities or birth defects? #firstbaby #pregnancy #advicepls