i have been going through fertility treatments and got pregnant. i am now 5 weeks and 3 days. i went to the doctor to have a ultrsound done, but he didn't see a heart beat. i am scheduled for another ultrasound next week. he said if there isn't a heart beat he would abort it. should i get a second opinion or what. the embryo is growing also so i don't know what to think or do. please help