Help im scared. Almost 25 weeks with a girl and havin pre-trem labor?

I will be 25 weeks sat. This is my 2nd didnt have probs with my first went over due and had to be induced he weighed 8 lbs 12 oz.. Im pregnant now with a girl and havin pre-trem labor at 24 weeks almost 25 i came close to havin her tuesday. But got my contractions to stop went to the doctor yesterday and he told me im on strick bed rest i can only go to the bathroom, take a shower and get food if my husband was busy with our son... He gave me a steriod shot yesterday and go back tomorrow and get another to help her lungs delevelop quicker.. How far do i need to be to make sure she has a good fightin chance. I want to make it too 34 weeks but my doctor dont think i will she is also drop and is all ready to come out head down and every thing... I dont want to lose her and im scared and my doctor isnt sure why my body is doin this with her.. She moves alot so i know she is okay then.. But today i had contractions again but my dr. Gave me pills to stop them and i took one they have finaly stop and i lay on my left side almost all day until i have to pee or eat and i dont sit staright up i lean back.. Someone with alittle help or couragement would really help me right now..