What is going on with my body?

I am now five days late. I've never been late except for my last two pregnancies that I got BFPs two days before I even missed my period. Now I have all the symptoms but my doctor called today to say the blood work was negative. She said to wait a week and see what happens. My biggest concern is my medications that I take could be harmful to an unborn child but I don't even know if I could still be pregnant. Advice please.