Bleeding after sex

Alicia
Today has been nerve racking for me. Hubby and I had sex around 8 am and immediately after we were done I went to the bathroom and noticed blood. All day I've had blood which is finally seeming to become lighter. I don't have any cramping or clotting which is a good sign I think? I called the dr on call and he advised me to get blood work done tomorrow and then again Wednesday to see if my hcg levels are increasing to ensure the pregnancy is progressing as it should. If any of you have experienced this and have any thoughts/advice it'd be greatly appreciated