Pregnant or going crazy??

The past two days I have been nauseous on and off and I have this really weird sense of smell. I am smelling everything and my husband thinks I'm going crazy. AF due the 20th. It's probably too soon to feel
These symptoms. Do you think it could be from the progesterone and estrogen I am taking? I did have an <a href="">IUI</a> one week ago on Sunday.