Thanks for posting,
It is totally safe and has no contraindications as it is an antispasmodic agent.
It would not affect the unborn fetus nor will it induce preterm labor
So she can continue taking the tiemonium
methylsulfate for a few more days.
But I do prefer that you talk first with her doctor before continuing the medications as his opinion is paramount. If the pain is persisting given that she has fibroids (which is a major risk factor of preterm labor), it will be best that her doctor reevaluates her for possible threatened abortion
(since it is still at 5 months) and maybe provide her with much more indicated medications such as myorelexant etc.
Hope this helps