Effect of drugs on menstrual flow. It?

I'm a 25 year old female. I experience regular periods with normal menstrual flow but with some uncomfortable cramps. I was advised to take paracetamol to ease the pain. But when I take paracetamol, my pain is gone for a few hours but I also noticed that my normal menstrual flow is significantly reduced on that day. The next day period is normal with cramps again. So I stopped relying on any medicines for my cramps since then. But yesterday I was diagnosed with paronychial infection and was prescribed some doses of drugs like aceclofenac, paracetamol and serrtiopeptidase as a combination drug and an antibiotic cefpodoxime protexil. The day of diagnosis coincided with the first day of my period. My period flow was normal until I took the medicines. I noticed that after an hour of taking the medicines my period flow is drastically reduced and it is the same till next morning i.e today morning. It doesn't usually happen this way. I weigh 60kg and my height is 5'5. Should I worry about it?