WHOA.... TWINS

Mima1285

Has anyone every found out that there were carrying twins in the second trimester, the ultrasounds in the first trimester didnt pick up the other heart beat. Well the reason Im asking is because Im currently 16 weeks pregnant and my womb is very larger and I feeling movement in two different places, I have my 18 week sonogram in Jan 6, i will be 17 w 6d but Im wonder if I need to tell the doctor to look a little harder to make sure it only one. I've also read in numerous articles that some woman didnt find out it was twins until after 20 weeks...