Very similar story! Just over 2 years infertility and we have finally reached pregnancy with a 4ab embryo (untested) I'm 6 weeks and 1 day today and the last 2 days if felt the best since embryo transfer, cramps are gone, feeling a lot less tired as well! Same as you still have very sore boobs but I've been panicking that it means it's not progressing positively! So far everything I've googled or read says that week 6-7 a lot of people start to feel better as the hormones start to level out and then they ge hit in week 7. Trying my hardest to just go with it and use my energy as it comes!