Weeks/Months Tracking

A
So. This may be a crazy question. But it's been a few years since my last baby. Okay. So. I'm currently 8 weeks. Easy enough to say 2 months, give or take right?
So after my 9th week, would I say I'm going into my 3rd month/am 3 months or do I still stay 2 months? Until I'm all the way through the 3 month and then say I'm 3 months?  This didn't used to be complicated. I feel like I'm over thinking something so simple. Lmao.