We've been together for a few months and only use condoms for protection. Recently there have been a few isolated signs of her being pregnant. I think I'm most likely just paranoid and that the pregnancy "signs" are just coincidences. However, they've scared me enough to want to talk with her about using a back up birth control method like the pill or arm implant. I brought this up when we first started dating (before our "first time") and she said she's open to female birth control, but only if she's in a long term relationship with someone.

Now I think she will be fine with getting the birth control, but at the same time I want to tell her that we should hold off on having sex until we get some. She gets mad easily and I don't think she will be happy about this considering we've done it nearly every day for months.

My question is how can I express that this is a good decision while attempting to minimize her anger since she has a hot temper.