Since you asked I'm going to give you an honest answer...
I had the worst morning sickness ever with my first pregnancy up until 12 weeks. At 13 weeks I found out the baby had died at 8 weeks.
So with my next pregnancy I was a paranoid wreck and couldn't relax. I don't really have any helpful advice for you except to think positively and try to enjoy your pregnancy.
My second pregnancy was successful and I now have a beautiful baby boy. With my next I'm really going to try my hardest to enjoy myself and not think about all the bad things that can go wrong.
Please try to just relax and think of all the positive things about pregnancy.