Six weeks pregnant and foolishly used an outside insecticide to spray the lawn that took about 10/15 mins to finish. should i be worried about baby?

Probably OK but...: This depends on exactly what insecticide you used and whether you inhaled much of it as you sprayed. It is important to minimize exposure to all toxins during pregnancy but esp. in the earliest weeks of pregnancy; hopefully not much got to your baby. My best advice, besides not doing that again, is to eat only organic food for the next few months to minimize any further exposures to pesticides.