3 weeks late, negative HPTS, had an ultrasound 2 days ago and the tech kept asking me if I was sure that I hadn't had my period. She said that there was blood flow coming from my left ovary and that I had a thick uterine lining, negative urine test. I had 3 positive Ovulation test last week where I engaged in intercourse, could I still be pregnant and it just be too early to tell?