I went to the doctor and was told I'm about 4 weeks pregnant. He did an ultrasound and could see the sac. He had bloodwork done to test the levels, and I had to go back in two days to see the progress. I went from 5,000 to 7,000. He wants me to come back in on Monday so he can make sure everything is developing properly. I'm really nervous now. Is this something I should be concerned about?