AM I PREGNANT??... I need answers!!!?

Okay... My last "day" I know I was on a period was June 5th... My husband and I had , condomless at first but finished with a condom, on July 2nd, 3rd, and 5th. On July 14th I thought I started my period so I put a tampon in and went to bed. Today, when I removed it, it was compleatly clean except for some mucus like discharge with brown, light pink, and bright red blood. All very thin streaks... I am also experiencing headaches every day, but NEVER get a headache, back pain lower and upper, frequent urination, nausia, very slight tenderness in my brests (near my armpits), and I have been extreamly gy burping and farting. I also never burp... But, I have also been experiencing a stuffy nose, sneezing, and tingling in my legs! I took two home pregnancy tests but they were both NEG. Im so confused... Any answers??? Im 19 and have had a past with irregular periods and more than one in a months time... ???help...