I spotted off and on until about 10 weeks. My doctor told me not to stress and spotting is normal in the first trimester.
I spotted at 5 weeks, thought it was nothing, but at 16 weeks found out it was something serious. Most of the time though spotting/light bleeding is normal.
I went to my doctor and they did an ultrasound. There's still a strong heartbeat so hopefully that means everything is okay.
Go to the hospital, miscarriage is always a very real possibility in the firsr trimester.