Generally black widows hide in small dark areas. If you see them out and about, it usually means their homes have been disturbed and they're looking for a new home. They're nonaggressive--generally the people who get bitten have invaded their homes and the spiders only do it in defense.

First, make sure that what you're seeing are actually Black Widows. Most black spiders aren't. If it was hairy, it wasn't. If it didn't have a red hourglass underneath, it wasn't. If, in fact you do have Black Widows around the house (which is possible), then what you do is up to you, but you might want to not panic too much about it; Widow bites aren't very common, and bad Widow bites are fairly rare. Consider that people love to tell scary stories, and nobody has ever had a story that couldn't be improved, so when you hear bad stories, take them with more than a grain of salt. Here's a link to what Black Widows look like:

http://bugguide.net/node/view/26336

Odd for one to be coming in the door with you. Could just be coincidence. Spray well all around the outside base of your house. I doubt it would just decide to jump on you. Spiders tend to get away as quickly as possible.....they do not attack ....only defend themselves when cornered!

Okay so I moved into this new house 3 months ago, but I saw a black widow before and sprayed it and killed it, then today I walked in my house and a black widow came in through the door.and I freaked out, because I was really close by it and I was afraid it would jump on me, but I sprayed it and flushed it down the toilet. But even though I only saw two, it still scares me and I have kids in the house and I don't want any biting us. What should I do?

P.S I live in Oklahoma if that makes a difference