First pregnancy

Hello mummies. This is my first time pregnant. I’m currently on my 13 weeks. Ok i have so many questions and if anyone want to share their opinions. please do. I really need it 1. I have no idea about going into labor. I’m nervous but i want to prepare my self mentally and physically 2. I am a big size person. My height is 170 and my weight is 103kg. I’m sad bcs my doctor told me I shouldn’t get pregnant bcs i have high risk. I am a very active person (I’m a farmer) I really hope i can go through this. 3. What type of test should i take to check any problems on me and my baby? Any suggestions? 4. I have sembelit. Can i eat something to detox it?