Help please.

So im 13 weeks 1 day with my 5th pregnancy. Went in today to check the babies spinal fluid for down syndrome and both myself and the ultrasound tech said it looks like a boy. I've had 3 boys so I'm familiar with a boys parts. But I've always found out at 18+ weeks with my others so it's no doubt. My question is how accurate do you think it could be seeing as I'm only 13weeks??? I have 3 boys 1 girl and was really hoping for another girl. Either way I'll be happy I'm just a little bummed. Ill get my blood tests back in about a week which will tell me for sure boy or girl. Just wanted to get your ladies opinions before I drive myself into a depression. Thank you.