My name is AAAA , I am I think 3 to 4 weeks pregnant, I took the test and got postive, but at the 4 the week, I started bleeding light and then it got heavy....with a lot of cramping....I went to the Er and they did a bunch of test, I am pregnant....but when they did an ultra sound, they saw no baby, just a yoke sack. I'm worried...is that normal?