I found out fairly early with my first 3 (aroung 19-20 weeks) and then we moved and I got pregnant with number 4 and my new doctor made me wait till almost 24 weeks for my ultrasound!!! I about died!!! We had 2 girls and one boy and we wanted a brother for DS so bad...it was the longest wait of my life!!
And as far as pregnancies go my first was a breeze.....and it was a girl. Pregnancy #2 was hell on earth!!! I throw up for 12 weeks and lost 36 pounds before I found an OB that would prescribe me anti nausea medicine.....it was another girl!!!
Pregancy #3 was not as bad at #2, but no where near as good as #1....it was a boy!! Pregancy #4 was close to being as bad as #2...but I only lost 26 lbs....it was boy!!!
Good luck....what ever is growing in that belly I hope it's healthy and happy!!!