Hello, I wanted to know if I'm pregnant. My pregnancy is 3 weeks and 7…

Hello, I wanted to know if I'm pregnant. My pregnancy is 3 weeks and 7 days old, but they can't see the baby on an ultrasound. I've done four tests and all four were positive. Two lines and I started bleeding on November 28th. They prescribed DFOSTAN and told me to come in for an appointment at 9 am for an ultrasound. Now I have brown discharge, and I want to keep the baby, but I don't know how to do it. I'm afraid of everything.