Spotting and Scared

I'm 5w3d and I began spotting very slightly this morning... I've had 2 early miscarriages last year sept and nov and ttc for 6 months after resulting in this pregnancy. I'm taking 300mg of progesterone per day but I'm scared it isn't working for me. So far no cramps but my hips have on and off twinges of slight pain. Any help or word of advice would be great! I'm waiting for my Dr. To call back but till then I only can pray this will be my rainbow baby...