Weird yellow/red discharge after losing virginity TMI

Hi everyone. I had intercourse for the first time three days ago. I bled and my discharge and urine has also contained blood since then but has gradually decreased. Today however, I noticed a weird yellow-redish discharge in my underwear. I'm also experiencing some sensitivity(?) in my waist/bladder area. I'm wondering if this is any cause for concern. Thank you for your help.