freaking out!

Okay so I finally got pregnant after trying for 2 years. I have taking multiple home pregnancy test and always getting positive results. My doctors appointment is for Wednesday the 19th. But yesterday I whipped and saw a very light pink but then it went away. Today everything has been fine but I just went to the bathroom 5 mins ago and I have brown blood now with cramping. I just called to have a doctor call me back but I am freaking out that I may be having a misscarage! I really hope not as I want nothing more than to be a mom and was so happy it finally happened! Please let me know what you all think!