Pregnancy week by week.

Pregnancy Week by Week- Week 21

Week 21

This was an exciting week for us! I ended up finding a last minute flight to Edmonton on Sunday to see Sam. I will post a flying while pregnant blog post once I get back to Ontario. The last few days have been amazing. Not only was it nice to get out of the week long rain storm in Ontario and into the sun of Alberta, but being able to spend time with my man, and get to listen to him talk to our babies every night before bedtime has been amazing. We have no internet at the house we are living at right now and only the one vehicle in Alberta so I have spent the last couple days while Sam is at work walking down to the local cafe to use their wifi. It has been nice to walk to the bustling downtown of Redwater šŸ˜œ. The worst part of this trip has been not being able to stay as active with the lack of chores to do but I have been making this up by walking a couple of kilometres a day and eating as healthy as I can.

Baby developmentĀ 

The babies are now 3/4 of a pound! And a whopping 27 cm/ 10.5 inches long. They can now hear the conversations around me and their mom and dads voice while we talk. Their skeletons are starting to change from cartilage to bone, which means their movements will become more noticeable. Their bodies are in proportion now and as their neutrons and reflexes develop they’re getting more and more precise with their Ā movements. Although they have been producing red blood cells with their developing liver and spleen, they now have bone marrow helping out with this. They are also starting to take in small amounts of sugar from the amniotic fluid. Because my twins are fraternal, they both have their own placentas and amniotic sacs. This allows both twins to have their own individual environments to grow in.

Types of twins


All Mono/Mono twins are identical, there is only one placenta, and one amniotic sac and both twins are from a single egg/sperm combination that spontaneously split during the first few days around the stage of implantation. This is the highest risk of twin pregnancies for twin to twin transfusion syndrome (TTTS; see last weeks post), as well as cord entanglement and compression.


All of the mono/ Di twins are also identical. This occurs when there is one placenta, and two amniotic sacs separating the two fetuses. There is still a risk for TTTS but slightly lower than the mono/mono twin variation.


This is the most common type of twins, and the most low risk. Although it means that there are two of everything growing, two placentas, two amniotic sacs, and obviously two babies. Each twin has their own environment decreasing the risk of tts but this can also means that there is a lot less room, and a lot more growing to do with the extra placenta. A small amount of identical twins can be Di/Di if the egg splits early enough, but all fraternal twins are Di/Di. My team has already confirmed that this is the type of twin pregnancy I have, and that they will not let me go the full 40 week gestation.


SO much movement! It’s pretty consistent now, and sometimes pretty strong! Every few hours or so they start up for 10-30 minutes and then they calm down again. It’s amazing to feel them.


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