How to tell him ?

A couple of months ago .. My Dad asked me did I need birth control .. At the time I said no because my boyfriend and I was going through a tough time and I refrained from having sex with him until we were back good .. Well it's been about 4 months and here I am waiting on my period . I feel the symptoms .. Eating EVERYTHING .. Clear white discharge .. A little , and I mean very little , stomach pain . I'm tired of having scares . I want to be protected because I don't want to give him a baby right now . We agreed to have a kid approximately 8-9 years down the line . I don't want to hurt his future , mine , or even our future together with a baby .. But how do I bring it up to my Dad that I'm ready ? He already knows we've had sex before .. But I'm sure he'll ask why are we starting again . By the way we don't use condoms because my girl down there doesn't like them . She feels really weird after we use them , which is when I'm fertile and ovulating . We use the pull out method and never has he came inside me or anywhere near "her" . We're about to turn 18 .