Should I take a PT?

I'm usually quite regular with 25 days between my menstrual cycle, however I am 3 days late with no indication that AF is going to turn up. But I haven't had any symptoms at all? I've suffered from strep the past week and just started antibiotics today, so I'm not sure if I may have been confusing symptoms of pregnancy with strep... I felt quite nauseous yesterday without vomiting and I also produced some CM yesterday that was an off white colour (slightly greyish) and there's been nothing after that. What do you guys think? I only have $75 on hand currently until I get paid in 2 weeks time because of bills and the out of the blue clinic appointment that happened today