Sex during first weeks of pregnancy

After a miscarriage we were blessed to be pregnant with no period in between. Since the date we learnt about this good news, it was at around the 6 week, in in the 7 week; my wife is afraid of sex saying that it is dangerous. Am okay and ready to wait until she feels it is time. I can even go for the entire pregnancy.

My questions are:

Is this fear founded?

Do you think it is okay if I just stay away as much I can?