Bleeding during first trimester

This has been an emotional week and I feel like I need to talk to someone besides my husband. I am around 6 weeks pregnant (estimate). Last week I started spotting a little on Monday morning for just a couple hours and it was just a very light pink, I called my doctor and they scheduled me to come in at the end of the week but didn't seem to worried.

That night as I am getting ready for bed I feel a rush of something (I thought I had peed myself) I go to the bathroom and it's a ton of bright red blood. I immediately burst into tears. I had a miscarriage in April and I just assume that's what is happening again. I call my doctor in the morning and they have me come in. They do an ultrasound and say they cab see the gestational sac but it's extremely small and there is a lot of blood and blood clots. They do a hormone test as well though and give me a prescription for Progesterone just in case. She tells me to come back in 48 hours but she is pretty sure I am miscarrying.

Later that night (Tuesday now) the bleeding stopped. I go back in Thursday and the doctor tells me when they tested my hormones they were all great so she wants to do another ultrasound to see if they can see anything different. At this point I'm prepared for them to confirm a miscarriage. They do the ultrasound though and there is the gestational sac AND a yolk sac! I was so emotional! The doctor said she was cautiously optimistic that everything actually looked like a normal 5 weekish pregnancy. She schedules me to come back in 2 weeks.

Yesterday,which was almost a week later, I started bleeding again. Bright red and a large flow at once again. This time it only lasted about 30 mins though and turned brown toward the end. The doctor said to still just come next week but I'm so frustrated not knowing what's going on inside me! Why do I keep bleeding? Am I going to have another miscarriage? My husband and I have been trying for 2 years and I just don't know if I am emotionally strong enough to go through starting over AGAIN! I just keep praying everything will be ok next week when I go back. This week is going to be hell waiting though.