TMI 3 months pregnant

This evening I went to the bathroom after feeling wet like blood in my underwear. When I went I saw something that looked like blood so I did my business and wiped and it was a lot of brown blood that it covered the whole toilet tissue, the blood reminded me of wiping during my menstrual cycle but brown, I was scared and I didn't know what to do so I called my mother in law and she liked scared and told me to keep an eye on. A little background about this pregnancy, I started having red bleeding a few weeks back and my ob told me that the placenta is completely covering my cervix. Has this happened to anyone else and what was the outcome?