Although breastfeeding offers some protection from ovulation, the monthly occurrence where you release a mature egg from one of your ovaries, it is possible to ovulate and become pregnant prior to getting your first period.
With perfect use (you follow the exact directions all the time) LAM is 98% effective against pregnancy for the first 6 months after giving birth. Think about getting emergency contraception to help prevent pregnancy if you’ve not followed LAM correctly and you’ve had unprotected sex in the last 5 days.

Technically you can still get pregnant whilst breastfeeding akk the time, so be careful. I think mine returned after just a couple of weeks. However I had been both formula feeding and expressing since birth, so I may have been a bit quicker than most?

It can take at least 6 weeks after stopping breastfeeding to get your period but you can still ovulate so use contraceptions or you can definitely get pregnant.