I'm a 36 yo, no prev m/c or bleeding. I have a 2.5 yo daughter, who was conceieved through IVF (my partner had a vasectomy). Had three further IVF attemps before I conceived again. At 14 wks PG, lying in bed, I had bright red blood loss (about the size of a saucer). I freaked out, started crying, thinking the worst - m/c. I rang our local hospital (40mins away) and spoke with a nurse, who urged me to come in. After I was asked all the routine questions: cramping - NO, dark blood - NO, clotting - NO, the doctor (under the phoned advice of an obstetrician) did a vaginal examination. The speculum, caused another bleed (about the same size as before), and I was told I was most likely experiencing a "spontaneous abortion". A horribly distressing term, when she could have just said "miscarriage". I had stopping bleeding almost immediately, both times and just had a small amount of old blood spotting. I was sent home 3 hours later, only to return for an ultrasound appointment the following morning. Baby visible and good heart beat! Woohoo! Placenta lowish, placental lakes/pools visible... which I was told could cause bleeding again. 4 nights later I had a small bleed (about 50c piece size), did not sleep at all that night from worrying, next day I didn't 'feel' pregnant, but knew I had to find out for sure. So went to the hospital again - everything still okay, and as far as yesterday - everything still looks good! Keeping positive.
So I guess if you experience bleeding during pregnancy I would suggest: don't lose hope, get it checked out as soon as you can (either way it could help you sleep better) and get a second opinion if you feel you need to.
P.S. This was a fantastic thread for me when I needed information and reassurance - THANKS!