Catheter and enlarged urethral opening

Okay so im 3 weeks pp and i had vaginal delivery with 2nd degree tear and had stitches. I had epidural so that means i also had catheters. Today after shower i looked down there with a mirror and my urethral opening is so big  compare to before childbirth. It looks like a pencil size in diameter. I dont have problems urinating or anything. Im just wondering does ut go back to original size?  And im just worried about urinary tract infection since the opening is bigger than before. Is it normal to be this big after childbirth? Was it the cathetetr that did this or was it from the childbirth itself? Please tell me it ll go back to normal