Hcg level to tell gender

Stephanie • My name is stephanie me and my husband has 5 beautiful kids and our first together on the way due june! I love my life!
Ok so I was reading up on this and I seen that they study that if you are having a boy it's lower hcg levels and if you having a girl it higher hcg levels so what does everyone think do you kno your levels with your kids before cuz I don't ? At 4 weeks I was at 300 and something with this one and it seems pretty low compared to some of the other hcg levels I seen??