Possibility of pregnancy?

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I am currently 3mpp and my husband and I had unprotected sex last night. I exclusively breastfeed my son and I haven't started my period yet (hopefully not for a long while too). I have read that LAM method of birth control is like 98% effective but I'm still a tad bit worried I could get pregnant again because I've heard you are supposedly super fertile after you have a baby. Has anyone been in my situation and ended up pregnant again so soon?