I just found out I'm 5wks 3 days.. the last week and a half I've restored my kitchen. All I've done is painted and primed with very poor ventilation. I actually felt sick from the fumes. I had no idea I could be pregnant as my period dates were all over the place this time round. There were 5/6 days at 4 weeks where I was just inhaling paint fumes. Oil paint too. Tmi but I even had gold tinged mucus from the spray paint I'd used on the handles 
I'm trying not to panic but failing miserably. A friend swears her child was cleft from inhaling too many fumes during her first trimester. None of their children before or after had any clefts. I did paint with my first child but that was water based, ventilated and I was 35 weeks. It was also just a day.