Asparin during IVF

My doctor told me to start taking baby aspirin after my egg retrieval. I took it for like two days and then stopped because I thought it was just to help with the healing process of my egg retrieval. Then on the transfer day he said continue taking the aspirin and I researched it and it can help with implantation! I didn't know this and am kicking myself now. So I have taken it the past two days, 4pills one time a day. It says on the package to take 4-8pills every 4 hours. Did your doctor give you a dose to take? Does 4pills once a day sound ok?