My daughter took 4 home pregnancy tests, 2 each from 2 different stores, and they were all positive. About 4am she started cramping and passed a large blood clot. We took her to the ER about 10am and they did a serum pregnancy test and it was negative. They said she was never pregnant but she was having symptoms such as sore breasts and nipples, and also feeling naseated when she ate and fainted a couple of times. She is still spotting a little. How is it that she could have that many positive tests and the serum test be negative now?