tanny_angelbaby
I will try to make it as simple as possible. Don't worry, I was just as confused as you.
When they say the baby is week 2, technically there is still no baby. Week 1 is actually the start of your LMP. The reason for this is under normal circumstances, it is extremely hard to pinpoint the exact moment when the sperm meets the egg. With IVF, it is calculated the same way. Therefore, when you get a BFP at the end of your 2ww, you are already considered 4 weeks pregnant. Bear in mind that there is a slight difference between 4 weeks and week 4. The period between 3w - 3w6d is considered week 4 (as you have already reached 3 weeks and going into your 4th week).
If your ET was on the 11/11 and if you are pregnant, you would be considered 3 weeks pregnant on the 18/11.
There is also a slight difference in calculating your EDD depending on your IVF protocol. Below was taken from
http://www.ivf-infertility.com/calc_preg.php
- If you conceived naturally and you usually have regular menstrual cycles, use the first date of your last menstrual period (LMP).
- If you conceived following insemination, IVF or after replacing frozen embryos in natural cycles, use either your LMP or the date of ovulation.
- If you conceived following IVF or ICSI in a stimulated cycle, use the date of egg collection.
- If you conceived following intrauterine insemination in a stimulated cycle use the date of insemination.
- If you conceived after replacing frozen cleaved embryos whether in a HRT cycle or stimulated cycle, use the date of replacing cleaved embryos.
- If you conceived after replacing frozen blastocysts, use the date of replacing blastocysts.
- If you conceived after replacing fresh blastocysts, use the date of ovulation.
It may take a while to fully understand but in time you will get the hang of it. Hope it helps and all the best.
Ladies, please feel free to correct or add on to what has been written. Thank you.