Try to think of it this way, You are pregnant today. I have had 3 losses total (so far). The worry is always going to be there no matter how far along you go. Realize that there is nothing you can do right now and worrying is not helping at all. The first trimester is a lot of wait and see. It sucks. Currently I'm waiting for the 21st for my scan and I know there is NO WAY I'm less than what I am right now 5 weeks 3 days. I know when I ovulated I know when I implanted so I know if baby doesn't measure on that day probably another loss. But I can't live my life in the what if. It's in the here an now. Again worrying is not doing anyone any good. If anything just prepare for the worst and then pray/hope for the best. Then let it go and see what the next scan brings. Yea the wait sucks but chances are things will be all right. Most pregnancies go to term. Even with past miscarriages or chemicals it only raises slightly the rate.