question little tmi

Brianna • Proud Air Force wife and Mother to two handsome littles boys. 🥰 #boymom
So went to the bathroom this morning an my urine was a pink color indiacting that there is blood there were a few stricks of blood and semen from last night all came out. Af isn't due til the 26th and I'm have lower back pain. Any suggestions on what might be going on?