Have anyone here have knowledge in medicine?

My period is late for 25 days now, in the beginning of this month, I checked the ultrasound and blood test, all were negative. My doctor described some medicine for my period fo come (she said also safe for pregnant just in case I conceive this month). She said if after my medicine, my period still haven’t come, there might be a chance I’m pregnant, I should come back to find her.

But yesterday, I found out that I have urine tract infection, so the other doctor described antibiotics for me, I told him my condition and he gave me Zinnat antibiotic, he said it will be safe even I’m pregnant. When I went home, I read the description of medicine, they stated there are still no proof whether this medicine is safe for pregnancy. Anyone here can let me know whether it will be safe? Sorry for my long post.