I am 5 weeks pregnant, I just had an ultrasound yesterday, it said: The Uterus is gravid with a single well-implated intrauterine gestational sac seen, but in the evening after I came home, I started having this really bad cramp, I couldn't move for like 10 minutes, when the pain was not so bad, I went to the bathroom and had a b/m, about one hour later, when I peed, I found this big clot size like half of my palm, I don't know what I should do, what is that clot? Did I lose the baby?