Definitely TMI

Okay so my SO was sucking on my boob last night while I was watching tv & stopped & made the most confused face ever & all I did was laugh so hard. I said "why are you making that face?", he replied, because something came out of your nipple while I was sucking on it 😂 we've been BD whenever because I haven't gotten AF since November (in the process of seeing a fertility doc) so I really never know when's the right time. But I looked online & you can start lactating as early as 4weeks.. what should I do? What do you guys think?? I'm confused. Btw he was very adamant that something came out .