HELP!

This will be my third pregnancy. My first ended at 5 weeks, my second at 7. I am currently at 4 weeks and 2 days. Yesterday I noticed that all my boob tenderness had gone, I was worried, but tried to to stay calm. This afternoon I started having Brown bleeding. When I got home I took a digital pregnancy test, and it showed as not pregnant. Does that mean I am loosing this one as well? I started progesterone as soon as I found out last week, thought this time would be different.