Kangol bags jigsaw

How can you be careful when your pregnant and dont know it? - can you smoke with a heart defect

I feel a little frustrated the way things work today. I'll try to sum it up, I was a smoker, she thought was pregnant, took a test came out negative. 3 weeks later I discovered that I was pregnant, so it was all the time smoking, quit the day I discovered. My son was born with heart defects. Every person I know who have smoked during pregnancy had babies healthy. It makes no sense. I wouldnt even take it to a place where people can smoke. How can these things do not work when you do not even realize she was pregnant until a month or later? I think it's my fault, but what should I do? UUUUGGGHHH! Just a bad day, I think.