Hello I Had Some Questions Regarding A Miscarriage.. I Been

Hello

I had some questions regarding a miscarriage..
I been having unprotected sex for about a week in total, being "ejaculated" inside and every time up until a week ago, the sperm came out. That time it didnt.
I havent been feeling any pregnancy symptoms (tender breasts, vomiting) although i have been feeling fatigue and headaches as well as a little bit of nausea and Extreme!!! Back pain.

I figure a couple of these symptoms are the result of me working my new job and attending school, not getting much sleep.

However, it is the day of my period and i have yet to have any bleeding and normally my periods will come on the same day no later than the 19th.

I googled some miscarriage symptoms and they all sound like what im going through (back pain, nausea, etc) but i have not had any "leakage" that could indicate pregnancy.

I took a pregnancy test about 2 days before my period (First response) and the result was negative but i am unsure

I also smoke and that could be another factor that leads me tp miscarriage.. I need answers and help!!!

Thank you!!!!