I had the double dose at 32 weeks (24 hours appart) because we didn't think were were going to be able to stop the contractions, then had a top up dose at 35 weeks and delivered less than 48 hours later and she really needed them, was a CS and we only just avoided a transfer to NICU. Yet our 33 weeker didn't get them and actually coped better but it was a VB.

I can recommend to relax and wiggle your toes the whole time it really does help

Good luck hun, can I ask why they are delivering early?
Take care xxoo