Do I have to use a condom for anal?

Hailey • Because I'm fifty shades of fucked up.
So I'm a virgin but I don't think my boyfriend wants it to stay that way for long and I'm really not ready for a child with my age and stuff but if we have anal( or basically if he cums in my ass) do we still have to use a condom? I never thought so but now people are saying that but would be smart to. Also I don't have to use one for oral right ?(if I suck his member) and sorry for all the questions but can I get pregnant from pre-cum ? I really want to get on birth control because I have problems with my period and cramps and stuff but I also want to get on it just incase I have sex but would it be maybe less effective since I'm a virgin at this point ?