What are the do’s and don’ts of pregnancy?

Dear Doctor, I’m 23 years old and a few weeks pregnant with my first child but I do not know what to expect. I live alone and don’t have many people to talk to. What are some things that I should avoid or get into? How soon should I start antenatal? Is there something I can take that won’t make labour too painful? I’m so scared.
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Dr. Rachna Pande