Yes
Yes.
There are those who start ovulate this early so you can get pregnant.
Yes
Yes you can have a miscarriage at 4 weeks I have hade a miscarriage at 2 weeks.
You can get pregnant NOW, it is not still from the miscarriage. If you feel like it, go for it.
Yes.
Yes.
Yes
yes,miscarriage is a great risk of a 3 week pregnant woman.
Im living proof! I had a miscarriage on march25th and found out I was pregnant on april19th.. I'm currently 6 weeks pregnant confirmed by ultrasound today:) 5/2/2011
No they can not.