Low grade fever

Hi all! I'm new here & was wondering if a low grade fever is okay during pregnancy. I should be 9w4d today. I get an ultrasound Monday. I also am coughing up the nasty gunk. Other than that I feel fine. My temp was 99.2 and then 99.4. But I checked it like 500 times so the 99.4 could be off lmao.