Cervical ? For the mommies

Dr
I always feel like my cervix is open, I can always put a finger tip width into it as if I'm ovulating, I've already had a child so I've heard that this is pretty normal. 
But I'm 6 days away from my period and I can still put my finger tip in there so does that mean I'm definitely not pregnant? Or is that normal for a second time mom?  
I know Your cervix should be closed for pregnancy, so I'm just worried it's a definite sign that I'm not pregnant :/