bleeding, again.

Im 15 weeks. I posted on here yesterday that I was bleeding after sex from the day before yesterday, it lightened up. A lot of you ladies were really helpful and gave me input and said it was probably a UTI. I went to my doctor yesterday, and she said it wasn't a UTI, and the baby and my placenta looked fine. She just said pelvic rest for the rest of my pregnancy. I was relieved. This morning I passed a VERY small pinkish whiteish clot. I've noticed the bleeding is mostly bad after a few hours sleeping and I get up to pee, which is when i passed the clot. Has anyone else experienced this? Should I be concerned still? I've lost two babies and im freaking out a little!