I understand your concern and I will do everything I can to answer your question. A little spotting and back pain are common in the beginning of the pregnancy and usually don t mean the pregnancy is in danger. The spotting usually stops on its own with no ill effects on the pregnancy. Doing an ultrasound every 2 to 3 weeks to make sure the pregnancy is growing is a normal precaution. When the heartbeat can be seen (usually when the sac gets to about 2 cm) that is an excellent sign the pregnancy is healthy and will continue without problems. Try not to worry: many women feel none of the typical pregnancy symptoms. Whether or not you experience nausea, vomiting, breast fullness etc. (and many women with healthy babies never feel any of these: no one knows why) the ultrasound is the only way to know how the pregnancy is doing. I hope that helps and best of luck to you