I had bleeding at 15w5d and we think it might have been because my placenta is a little low lying. I haven't had any problems since that day. I had bright red blood and passed some clots, but no pain. I had brown spotting/blood for about 6 days.
Even though we confirmed the heartbeat that day, it still took me more than a week to relax. I hope it all turns out well for the Mrs.