Pregnant or period?

My boyfriend & I have been trying to conceive a second child for 17 months now. I'm 20 years old, he's 25, and the doctors say we're both perfectly fine and healthy but have mentioned me possibly having unexplained infertility. Well. I ovulated June 18. So my boyfriend and I were busy from June 17th-21st. July 1st I had really light spotting for a couple hours. I was supposed to start my period on the 12th so I'm late right now by almost a week. I've taken 3 pregnancy tests, 3 & 5 days ago, and 1 tonight. All said negative. Yet I'm having all the exact same symptoms as my first pregnancy. Now about an hour ago I wiped after going pee and I had really light pink discharge, not even spotting or anything just discharge. Im terrified as to what it means. Is it possible I'm pregnant? Or is my period coming? Could I be testing too early? Has anyone dealt with this and was it pregnancy or period related? I'm trying not to stress, but I'm feeling excited and am so scared i'll just be disappointed after another month of trying.