Possibility of missing twins?!

Hey everyone, sorry for this post and please no negative comments.

I am currently 27 weeks pregnant, I’ve had several ultrasounds including a 3d ultrasound, and we have never seen a second baby. However throughout the past three weeks we have been using our fetal Doppler at home and finding two heartbeats, both are fast, both sound different, mine is MUCH slower than the two beats we have found and mine is the third heartbeat I’ve found. They are often on different

sides of my belly.

In addition I have also noticed that I am much bigger this time around than I was with my first son. I know you are usually bigger the second time around. In the picture with the dark blue shirt I was 36 weeks pregnant, in the lighter blue shirt i am 27 weeks pregnant.

Look, I know how incredibly rare it would be for them to miss a twin, especially this far along but has anyone either experienced something similar to this and what was the outcome?

36 weeks...

27 weeks..