I found a black widow living by a cabinet in my home and killed it...?

It was a female of large size, and after touching the web to be greeted by a spider crawling toward my hand, I immediately screamed and got the bug spray and killed it. Today, as I was cleaning that area, I found another spider crawling on the floor only it was brown. I immediate ran to the bug spray and killed it again. After examining it, I realized it is a MALE black widow. I know that males are eaten after mating. Should I be looking for an egg nest though? Please help because I am scared to death by these kind of spiders.