I had urinary tract infection and gastritis a few days ago, however after taking antibiotics and medicine I felt better and it went away. However, I got my period two three days later of my meds finishing, and I have very less pain and period flow. This is unusual as I get heavy periods with too much pain and flow, but it?s the opposite. My period lasts for almost 6-7 days but it lasted with less flow for only 4 days. What must be the reason?