What Are The Symptoms Of Miscarriage?

i am 41 and prego yet i hope! Just miscarried back in aug. My last period was dec 4, 2010. I just went for my 2nd ultrasound on tues. my pregestrone levels are down to 7.1 & my hdg blood level went from 11,000 to a lil over 6,000. thats why they wanted another ultrasound. We gotta see the baby moving around & its heart was beationg strongly! 171 beats a minute. right befor my ultrasound i saw a slight pink discharge. I had to meet with my dr on wed to find out my results. my Dr told me they found on my last ultrasound there was sum blood pooled. yday i was cramping, bleeding,& a few lil blood clots. I can't be miscarring again already can I????