First pregnancy

Hello, I'm 22 years old and this is my first pregnancy. (Though not really sure pa because we just based it on the pregnancy kit result which was positive). My parents are still unaware of my situation and I don't know how to tell them. Due to the enhance community quarantine I did not have the chance to get a check up to an OBGYNE. I am now worried that I am lacking the vitamins and nutrients needed for the first trimester of pregnancy. Any tips and advise? Thank you for your response.