I hope you feel better soon!
It can be really scary to find out you have COVID, but try to remember that many people have a mild illness with it, and that by having had 2 vaccines you've helped reduce the risks of developing severe illness. Even if your last dose was a while ago, it's better than nothing and puts you in a better position to fight this off.
I'd suggest contacting your midwife or antenatal clinic as soon as you can, to let them know. They can then assess your risk of blood clots and may prescribe you medication to reduce that risk.
Otherwise, general self-care advice is a good place to start - plenty of fluids, rest, keep eating when you can, symptomatic relief (eg throat lozenges, paracetamol). If you have any underlying health issues like asthma, make sure you keep your treatments (eg reliever inhalers) accessible for you to use.
If you feel like your symptoms are getting worse, like a prolonged tightness in your chest or increasing shortness of breath, have a low threshold for calling out of hours services to discuss with them. It's much easier for them to manage things at an early stage.
Get well soon!