Usually when you get a UTI from having sex the sypmtoms start about 24h or more later. The pink in the urine could be some blood. That just means the infection has gone to the kidneys. This is a guess. I would go to the doctor tomorrow and get a urine specimen done and tell your doctor the sypmtoms your experiencing.
Blood in the urine can present in one of two ways: gross hematuria (blood that you can see in the urine), and microscopic hematuria (blood that is only seen when the urine is examined under a microscope). Both types can have serious causes. If you are passing different-shaped clumps in your stream, they could represent bleeding from the urethra or prostate (in men). These clumps can be wormlike, and if associated with pain it could represent clots coming from your ureters(tubes from your kidneys to your bladder).
So the various possibilities in your case are UTI, Pyelonephritis, Cystitis, Urethritis Glomerulonephritis and Urethral ulceration.
Diagnostic tests that may be performed include Urinalysis, Urine culture, X-rays of the kidneys, Cystoscopy, IVP, Abdominal ultrasound and CT scan of the abdomen.
The treatment will depend on the cause of the blood in the urine.
Pls consult your urologist as soon as possible to avoid any further complication.
Take care and do keep us posted on how you are doing.