I know where you're at and it's a tough place. Luckily for you though ( <IMG SRC="http://www.healthboards.com/ubb/wink.gif">) I did SO much research on the questions you brought up that I'm overflowing with info on it. <IMG SRC="http://www.healthboards.com/ubb/smile.gif">
Do not fret. Here's what I learned. I got the light spotting, I got the cramping (they got BAAAD at times) and the twinges were there also. At 12 weeks now they're all still around, minus the spotting and my baby is doing great. If you spotted lightly and had an ultrasound POST-SPOTTING and saw a heartbeat on the ultrasound your chances of miscarriage are VERY low (less than 5%) after that point. Seeing the heartbeat was the important detail in the articles I read, as most embryos that miscarry never acheived heart-beating "status". Once you HEAR the heartbeat by doppler (which your doctor should be able to help you with in the upcoming weeks) your chance of miscarriage drops even lower to 3%. So try to smile if you can. If you saw your little one's heart beating on ultrasound, you most likely just had the spotting that 20% of us have during early pregnancy and go on to have beautiful healthy babies. If your spotting starts up again though, be sure to call your doctor. But if it doesn't show up again, as hard as it is right now, try not to be concerned about the cramping and the twinges. I've had them since week 5 and now at week 12 they're worse than ever. I was so concerned that I got a home doppler so I can listen to my baby's heartbeat every day. It helps a lot when the cramps and strange twinges kick in especially bad, to hear him in there chugging along and know that the discomfort I'm feeling is no cause for concern - he's still in there oblivious to it all. <IMG SRC="http://www.healthboards.com/ubb/smile.gif">
I hope all goes well for you. Have a cup of decaf tea, rub your belly, tell your little one hello for us and please keep us posted on your progress.