hi , I am 5 months pregnant and woke up shivering last night i couldn't get myself warm, my muscles were that tense the pain made me cry, I had a temperature of 38 last night, I have constant headaches and a very sore throat, it hurts to move my head around as it feels heavy with pain, and i have not slept all night and been sick this morning, I haven't had my rubella vaccine, i'm not sure if it could be this?