Hi, hun!
It's quite normal, don't worry. Your body is undergoing so many changes! When I was in 2ww (Ukrainian Biotexcom clinic, 2 nice healthy embies transferred) I did a lot of research and just thought it would be interesting for you to read this as well
Below is a list of what happens after your transfer to your embryo after IVF, day by day.
After a 3 day transfer:
One The embryo continues to grow and develop, turning from a 6-8 cell embryo into a morula
Two The cells of the morula develop into a blastocyst
Three The blastocyst begins to hatch out of its shell
Four The blastocyst begins to attach itself to the uterus
Five The blastocyst begins implantation
Six Implantation continues
Seven Implantation is complete, the placenta and fetus have begun to develop
Eight Human chorionic gonadotropin (hCG) starts to enter the blood stream
Nine Fetal development continues (hCG continues to be secreted)
Ten Fetal development continues (hCG continues to be secreted)
Eleven Levels of hCG are now high enough in your blood to detect a pregnancy.
Your two week wait (2ww) starts the day of your transfer. If you have a 5 day transfer, you will likely get a positive pregnancy test 2 days earlier than with a 3 day transfer. This is because the 5 day embryo is more developed.
No wonder we happen to have that ache! Keep calm, dear, everything's going well! Xx