Confused. Needing some advice please...

[Mummy&Daddy2Be]

Hi ladies, I'm freaking out a little. Feeling a little overwhelmed. I'm 5 weeks ish pregnant. Do I have to have an OB\GYN?? We don't have private health cover. I always imagined that you just see your GP, get referrals when you need scans\tests etc, pick which hospital you want to birth at & bobs your uncle?? Probably sounding naïve but I don't really know lol..... I've also read a few threads that say they were counted as high risk because of their BMI etc & some hospitals don't accept you??? My BMI is not in a healthy range :\. I'm just freaking out a little. We did miscarry last year & I just want to make sure we follow the right steps needed. Could someone explain why\if you need an OB\GYN? & if you can just stick with your GP etc? I feel so silly asking these questions. Thanks so much x