Ay oo naman, possible talaga kahit may condom because walang contraceptive na 100% effective, lalo na if may breakdown or slip, a few of us moms experienced that din kahit "protected" But ang brown spotting mo in early pregnancy ay common, at ang fact na purely breastfeeding ka pa ay may chance na nag-delay ang cycle mo because of hormones, so hindi guaranteed na pregnant ka agad from that Nov 8 encounter. Kailangan mo talaga mag-take ng pregnancy test to be sure, or check with your OB para ma-confirm, mas peace of mind mo lalo na if may symptoms ka na nararamdaman (like nausea, tenderness, or anything off).