This week marks the exact half way point for me (unless they come a little early in which case we are more than half way now!). As we are having a C-Section at 38 weeks then the 19th week is halfway.
I've read up on what's going on this week and there seems to be a disagreement on some websites over how big they are at the moment, I've read that they are 11cm, 14cm and according to the NHS 19cm! at the moment :) So who knows, I guess they are somewhere in between those numbers, but judging by the amount of movement I've been feeling lately I'm thinking they are bigger.
They are continuing to is swallow amniotic fluid, and their kidneys continue to make urine. Hair on their scalp is sprouting too now (probably blonde!)
Sensory development reaches its peak this week. The nerve cells serving each of the senses – taste, smell, hearing, seeing, and touch – are developing in their specialised areas of the brain.
Nerve cell production slows down as existing nerve cells grow larger and make more complex connections. Both girls already have roughly six million eggs in their ovaries. By the time they are born, they will have about a million.
One site says that I may have felt the kicking and somersaulting of your growing baby and at times, you might find that she is so mobile that you can't sleep. Well I have - I've started to feel the kicking from twin 2 (the one at the top and the front) but not so much from twin 1 yet, but I'm guessing this is because she is at the back of the uterus. The next 10 weeks or so will be their busiest and most active time, until the uterus gets too crowded (which isn't going to take long now!)
So things are OK here - they are moving, I'm still not bleeding (3 weeks now!) and I am hopeful that we will make it through the next 5 weeks to the 24 week mark - that all important milestone.
Wish me luck.