Blood pressure scare

Went to my doctor for a check up yesterday morning and my blood pressure was a little high so they waited an hour and checked again and it had went down so they let me go home. Later that day I didn't feel good at all. I was dizzy and had a terrible headache so I took a nap. I woke up feeling worse! My blood pressure was 156/99 so I called my doctor and they told me to lay down for 20 minutes and recheck it then call back. I did that and it jumped to 176/112 so they made me go to labor and delivery immediately! Luckily, they got my blood pressure to go down some and there was no protein in my urine so they ruled out preeclampsia. But, the baby's heart rate was elevated and I was having contractions. They gave me brethaine shots and procardia and I was still having some contractions but not as regular or strong as before so after 6 hours they let me go home. My doctor has told me the goal now is to keep her in until at least 35 weeks. I'm currently 31 and I've been having preterm labor contractions on and off since 25 weeks!