Did anyone take Duphaston/dydrogesterone during pregnancy?

I took duphaston after I hv bleeding on my 10th week until 18 weeks, after no more spotting then stop taking it, but I still hv 4 pills left, my gynae said for incase I hv spotting again. I took 6 pills a day (3x2). The duphaston is cheaper than the jab, jab cost me $100/jab. Luckily I only had a few times jab, only when the the spotting happens.