I'm almost done with the first trimester & I'm wondering if it's still okay to continue to breastfeed my 21 mons old baby while I'm pregnant?

I’m still breastfeeding my 31 months old girl also. Was told to stop by gynae cause of cramps and spotting. But i have difficulty stopping my girl from wanting to latch, so my gynae gave some meds to help relax the uterus also