Did anyone become pregnant while exclusively BFing? When did AF return?

I had my son on Sept. 6th. And I think I'm ovulating.. gunna test later. I have all the signs. The cramps, cp is all right, fatigue and I had ewcm last night that was pink tinged..

Also read that twins is 9x more likely while bfing, brought this up cause my LO before my son was a twin, though we lost her twin at 11 weeks.