The “right” steps in a relationship..?

To get to the point this is my first relationship we’ve been together for a month, idk if we’re “taking things slowly “ bc I don’t have other experience to base it on. Last time we were together he asked me if he could go deeper “touch me” and i said “no not today” bc I thought i’ll have my period and wore a tampon in case.

The thing is I sometimes get horny and wanna do all that but i’m afraid I’ll react strangely if i saw his (dick) or actually had intercourse.

Bc as i child i have been sexually abused. So...