Spotting 5 weeks 4 days

Rosa
So I'm 5 weeks and 4 days and I just wiped and there was a small amount of light brown discharge. I'm kind of freaking out at this point. First baby and I'm scared to death of miscarriage. Its only noticeable when I wipe. My hubby and I 'did the deed' earlier and I had an O. I'm wondering if that could have caused the bleeding???