went to the dr. yesterday to confirm that i am pregnant. i should be around 4/5 weeks. they did an ultrasound and couldn't see anything. so they ran a blood test to check my levels. my HCG levels are at 157. So i am pregnant, but is it really low. they asked me to go and have another blood test tomorrow morning so that they can compare my levels. if the numbers have not tripled then that could mean that my pregnancy is going no where. this is my first pregnancy, and a little worried.