MASTITIS! HELP

Co

So I just need some insight or advice on this...I’m not 100% sure if I’m pregnant or not. If I am I’d be about 5 weeks. I have taken test after test and they keep coming back negative. Well last night I started experiencing grey discharge from one of my breasts. I went to the dr today and he said I have mastitis. I told the nurse that there’s a possibility that I might be pregnant but they didn’t do any tests and it want brought up again. Well I took my temp yesterday and it was at 98.8 and I took it again just now and it’s at 99.4....I’m not really sure what to do or why it’s happening to me. I have to go get the antibiotics but I don’t want to take them until I find out for sure if I’m pregnant. (I don’t have insurance till January 1st so i can’t just walk in to my dr and get a blood test. She’s completely booked up till next month anyways