I need advice

Hi I'm 15 really young and I'm currently 4 weeks and 3 days pregnant. I'm so happy for this blessing ❤️. But I still haven't told my mom, how should I tell her? And when is the time to tell her? HELLPPP!! Oh yeah and my symptoms are really stressful 😐💯 I throw up a lot and I'm always tired like I have no energy all the time but tbh//....I'm so scared because of the miscarriages and issues I don't want my baby to have I want to have a healthy baby because anything could happen