I recently had sex and it is my first time and just yesterday (almost 1 day after I had sex) that I feel the frequent urge to pee and most of my pee only has few drops of urine. Then after few hours, I noticed some few drops of blood on my urine once and a little pain after peeing. I drank lots of water which made all of this stop temporarily. Then just today, I am feeling all of this again including few drops of blood on my urine and a slight pain after peeing. What could am I experiencing? I am worried and hope this isn't serious. Thanks in advance.