sex drive gone wild...

I am so frustrated with myself. I feel a constant need for sex lately (I'm talking wanting to fuck for hours every day.) my fiance can't keep up and the damn toys keep running out of battery. he has cum inside of me on a number of occasions all on days the app showed I was at a 1-2.5%chance of pregnancy. I never feel like this and typically after one good fucking I am good for a while. is increased sex drive a sign of pregnancy early on? we don't use protection and pull out has always been our go to method of prevention. we are not going to be disappointed if a pregnancy comes of it but what bothers me is my raging sex drive. I'm 36 and should not feel like this (I think) .. thoughts??