help please! tmi post!!

I am 32 weeks as of today, and on monday i was in the hospital having contractions and im dilated to a 1.. they sent me home because the "preterm labor swab" came back negative and they gave me the terbutuline shot to help stop the contractions..
Now its wednesday, im still having contractions, not as major as mondays, but still having them. And i just went to the bathroom and wiped and this came out. Its the size of a quarter and has a brown streak in it. 
We lost our first baby at 20 weeks so everything is still very new to me. But im scared this could be the mucus plug. 😣