16 weeks bloody mucus fell in toilet?

I havent been cramping my stomach just feels a little sore from growing i assume. I went to the bathroom and noticed a long stringy bloody mucus in the toilet.. It had somewhat of a brown tent but mostly a pale red... I'm nervous and i've called the OBGYN and they said go to the ER if it gets worse... Is this normal at 16 weeks.. It almost looked like a mucus plug but its way too early to lose that... I've also been experiencing quite a few braxton hicks... Ugh anyone have any friendly advice?