Hi, I'm 21 And I Had My Ultrasound Yesterday, Exactly

Hi, I'm 21 and I had my ultrasound yesterday, exactly 10 days after sexual activity and my ultrasound findings was thickened endometrium it's 1.6cm my doctor says that it's normal since I'm going to have my period on the first week of October. But I am experiencing a lot of pregnancy symptoms like fatigue, breast tenderness (which is normal with me when My period is approching), mood swings. I also have high milky or cloudy white discharge, but I am taking provera tablet. And based on my research, provera can cause discharge, but I think it's alao one of the pregnancy symptoms. Is it possible that I am pregnant? It also says in ultrasound that my cul de sac has free minimal fluid. What does that mean? Thank you in advance