Anyone have an positive advice???

Took at test two weeks ago and it came out positive three times. According to my period I should be 7 weeks. Been experiencing light cramping but nothing major. Last night I started bleeding and it was a lot at first but now it’s just very light, only when I use the bathroom. Had an ultrasound and she said my uterine wall was think but she didn’t see anything. HCG levels at 300 and test still positive. They said I could just be earlier but I’m depressed thinking I’ve lost my baby. Anyone have this and still come out pregnant??