33 weeks pregnant, went into preterm labor, the doctor stopped it, will I go into labor again soon?

I am 33 weeks pregnant with my and my husbands. I am a special education teacher and I was at school teaching. I hadn’t noticed any pain except for slight cramping during the previous nights. I went to the bathroom to pee and found bright red blood covering my panty liner and blood when I wiped. I was in shock. I went straight to the hospital; they hooked me up to the monitors and said that I was having lots of contractions and that they were going to need to stop the labor. First they wanted to do a sonogram. The sonogram showed that my baby is already 5-6 pounds and he is completely in position to come out. He was so low that the sonogram wand was placed all the way down below my pelvic bone to try to get a reading of the size of his huge head! He was developing great they said. Next the nurse came in and gave me a shot and a pill that I have to take every four hours for the next month. I am shaky and my heart is beating out of my chest. I am not sure why they had to stop the birth if he is healthy and wants to come out. They did not do a pelvic exam on me because they did not want to start dilation or increase it so I have no idea what the blood was or if I am dilated!!! I am on bed rest with light activity. I guess my question is while on this medicine how long can it stop the baby from coming? If he is that far down, won’t he just come when he wants to? And can my water break while I am on this medicine? I am so confused and they are giving me confusing information. Help!