HELP: I Caught My Husband Sleeping With The House Girl.

I am Funke Akinyele a married woman with 3 kids.  I've been hearing stories around that my husband has been enjoying himself with the house maid but i never believed due to the trust i have for my husband and i satisfy him in bed very well. Since the stories started getting much, i played a trick. I got the shock of my life when i caught them red handed after setting a trap for the two secret lovers.
I pretended as if i was going to my shop and sent the the maid in my husband's presence to go to the market and buy foodstuffs. The maid took the money and immediately my husband got up and walked out, saying he's taking a walk... I drove out of the compound and parked the car about 200 meters away and walked back to the house.I decided to walk back home.
I entered their sitting room, my husband's bedroom, the kids room, nothing. I decided to check the house maid's room. True to my suspicion, i caught my husband very busy on top the maid.
This young girl is already pregnant for my husband and he is saying he will marry her as his second wife. I'm so devastated. What do i do please?