Is Saffron safe to consume during pregnancy?

None of my friends had taken Saffron during their pregnancy but I've read on forums how it has helped ease heartburn for some of the ladies. They usually add one or two strands to a cup of milk for consumption. That being said, I saw that Meadow saffron was listed on the National Healthcare Group website as an oral supplement to avoid during pregnancy (last table): https://www.pharmacy.nhg.com.sg/page.aspx?id=684 I suspect it's because in large doses, saffron can act as a uterine stimulant and could cause contractions. Therefore, it may be good to check with a pharmacist/doctor for the recommended dosage that is safe for pregnancy.