31w3d- contraction again

Can Betamethasone cause uterine contraction?  I see a common pattern ya. I had my second cycle of betamethasone injections on wednesday and thursday two weeks ago. I started to have uterine contractions on friday midnight. I had my third betamethasone cycle this wednesday and thursday. I felt uterine contraction again on friday midnight.

Is this a coincidence?  Oh my, my obgyn wants to put me on hospital arrest for three weeks. Do I deserve that sort of punishment? Am I a high risk patient of its just a transient phenomenon? 

Although I was able to haggle for bathroom privilege, I felt self-pity. I dont have my own bathroom. I have to bring my own bag of toiletries whenever I go to the bathroom. That is my life in maternal ICU. It is hot here. Magnesium sulfate had also contributed much heat. I used Bricanyl and Magnesium sulfate this time. Last time, we just used isoxilan.