Advice

I have been dating my boyfriend for around a month and we have a sexual relationship obviously, I’ve been on Birth control since March of this year and I just got a new brand or kind of BC this month. I haven’t skipped any days so far cuz I know he never pulls out 🙄 but I’m nervous I could be preg tho, I took a test and it said negative but I haven’t gotten my period in over a month. My period is always irregular so maybe I’m over thinking it. I have skipped a whole month and a half without a period before. Just nervous about it, let me know what you think please! (I’m only 18 and as much as I would love a baby right now I can’t afford one, wish I could tho😞)