Hello,
Not sure that I can be much help, but I was told to go on aspirin (as well as prescribed heparin) before my FET. I was on 100mg per day (not sure what strenght baby asparin is) and started about a week before transfer and continued all the way through the pg. I should also say that I was prescribed both aspirin and heparin due to a diagnosed condition that prevents implantation.

Good luck and really hope you get a wonderful belated xmas pg!
FG