Is wireless router bad for pregnant woman?

My wife used to watch videos online when she was pregnant in the 2nd to 3rd month, using the wireless router at home. About 6-7 hours per day and lasted for less than a month. The more important thing is we didn't notice that the router was about 2-3 feet from her body. By the way, the router is Netgear WGR614 54Mbps. We moved the router further when we noticed and we seldom used it anymore. Now it's the 7th month and the doctor said it was no problem. But we are still a little worried about it. Anyone knows about whether the wireless router is bad or not for pregnant woman? Thanks a lot....