Pregnancy test :0

So I was in the hospital on heavy duty antibiotics for about a week and a half starting oct. 9. I was expecting my period the 17th. However I know that because of the strength of the medication, it could postpone my period up to about two weeks. (I know this because I was in the hospital once before for a longer period of time.) Anyways, I had unprotected sex about two weeks ago. Still haven't had a period and since then my stomach has been uneasy and I've been feeling nauseous. I didn't think much of it because I normally get sick with weather changes. However I decided to take a test and the first one I took about a week ago and it was ept but the response didn't match the results. So yesterday my friend told me to take another and the result turned out to be unclear. I looked up on the first response website to try to make the result a bit clearer. What should I do? Go to a doctor? Or wait til the end of the week and see if I get my period as it is expected?.