Dont call pest people come first. I think there could be natural remedies for your situation. I googled before they said u can bait the ants with baking soda mixed with some chemical, make sure u dont have small kids, and place it where they frequent, add sugar to it too so they will be attracted, then they will eat it and bring to their queen and they will all die together. Or something like that. Pesticides is quite dangerous for pregnant women. Better do that as your last resort. The chemicals they use are very harmful. Last time I had a client calling pesticide to spray anti termite chemicals and gosh, the house stank for the whole day! And its actually harmful if inhaled! Tsk..