A.G.
I've been there with the ants. We were completely overrun with them culminating in dozens of different lines of them on my daughter's first birthday party with people coming to our house. I wanted to avoid anything toxic (not pregnant, but have 2 kids and a cat). We didn't even want to spray outside because the cat and the kids play out there. We've used Terro ant baits. They are made with boric acid, which is alot less toxic than other stuff out there. If the ants are coming in somewhere behind things (or in our case above our cabinets and behind everything you could think of) you place the baits there. They take the bait back to their nest and then they die. You have to let the ants run their course. They will swarm the trap and have a trail leading to it for at least 24 hours but the ants will go away for awhile.
Even when you spray the outside, the ants will come back.