Please help me

I’m a few days late on my period. My breasts aren’t tender and I have 0 PMS symptoms. I took a test and it was negative. However, my skin has been really bad out of nowhere and for a few weeks if I do anything slightly strenuous I get extremely nauseous. Like almost gonna throw up but not really. I keep burping instead. I am very scared, I’m not ready for a baby and I don’t know what to do. I think I would chose abortion if it came down to it and I know I’d be judged on this decision. I know my mom will constantly throw it in my face. I don’t know what to do. I am 23 btw. I’m so scared.