I bet your female came in to breeding condition. It happens shortly after having kits and then for 24-48hrs about every 24 days. It could also have been babies making noise. Some males really like babies and will talk to them, bounce around, and even threaten you from another cage for handling them.
I would not try to intro a male to a female with kits. Females can be very protective of young chins. We weaned some kits in to a cage with a pair of females who had gotten along for the past 6 months. The older one started threatening us when we got near them and then suddenly one day just tore up her younger cage mate. We think it was a misunderstanding over the safety of the young ones. It's best to wean the kits and then reintroduce the pair. Kits can be separated at 8weeks but preferably they should have an adult role model until 12weeks. It makes them easier to introduce to other chins and more likely to get along with a wider variety of cagemates.
