They strongly recommend not getting pregnant on meth. It has a tetrogenic effect on the fetus. I have a latex allergy also. I take a very low dose birth control called microgestin. I've been on it over 5 years now and love it. I started on a higher dose but had an extreme sensitivity reaction to it. They do make non latex condoms which can be very expensive. The only other thing I can think of is a spermicide which can be messy and it's not as effective as other things.
I'd rather be hated for who I am, than loved for someone I'm not.