How early is too early to test


So I’m 6 days out from AF and the panic is setting in. My hubby and I have been trying since November. It’s so frustrating. My twin sister gets pregnant almost immediately (both pregnancies). I’m having a hard time. I’m tracking my ovulation. We used presses this month. I’m just so nervous that my heart is going to break again this month. My sister tested 4 days before her missed period both times and got her BFP. Do I do the same or wait? And how long should I wait? The waiting is killing me.