1st ultrasound

I had my first ultrasound today.  I was so excited and nervous!  The downside was that we only saw one baby, but the great news is the baby we did see had a great heartbeat.  I was a little worried because the doctor could see some tissue. She said it would probably go away, but I don't know what it is so it worries me.  I was also bummed because there was only one baby.  I just can't understand why my numbers were so high and why I've felt so sick with just one baby.  I guess it's just proof that this baby is unique in his/her own way already!  Even though I'm sad, I'm also so thankful for a healthy growing baby!