I heard drinking milk help gets rid of toxins you inhaled while doin something, so maybe drink lots of milk just to keep ur mind at ease. My husband was told that by some foreign doctor, cause he works a lot with toxic finishes for hardwood floors. But idk how much of that is true... but wouldn't hurt to try...
That short duration of exhaust inhalation should not harm your baby. Try to avoid extended periods of any toxic inhalation in the near future. Never feel like any question is silly. Your care and concern for your unborn baby is what will make you a great mother! Good luck and Congratulations!
I don't see why this should harm either of you as you could breathe car fumes just walking around. I would check with midwife to be on safe side plus baby ready to come out and your immune system should protect him/her xx