Stage 2 bedrest

So on the 18th I was in the hospital for contractions...it took a shot two pills n IV to finally stop them....but now I'm on stage 2 bedrest...i can't do anything besides go to the bathroom n take shower...last friday i had to take a non stress test which I passed...then I had to get a sonogram n my fluid is lower than my last sonogram...I have another sonogram this Friday but worried that my fluid is even more lower....and she's measuring about 6lbs...n I'm like 35 wks along...I'm kinda scared...I don't know wat it even means when ur fluid is low...hopefully I get some answers this Friday....