Safe drugs while TTC?

Hi, yesterday i was prescribed several different drugs by the doctor to take for stomach/pelvic pains and nausea - 
Duphaston (I've only been TTC for 15 days - seems early to be taking these no?)
My question is whether it is safe to take these on the off chance that I am already in the vvv early stages of pregnancy? Or even just as we TTC?
I know it's a pretty medical question but if anyone has any experiences or recommendations, I'd be so grateful!