16 days late. 2 negative and 2 positive

[Janicearroyo1]

I'm 16 days late for my period. I'm very regular and I'm not stressed. I took two test last week when I was 6 days late and 2 test were a faint positive...I took one yesterday and it was negative. I also went to a clinic they did the urine test and it was also negative....I don't feel crampy or anything. However, I've had sore nipples, fatigue, headaches, frequent urination and insomnia and tossing and turning throughout the night. I've never missed a period. So I'm pretty confused...help? I went to the bathroom and when I peed I felt a little gush...I wiped in there was a Tiny spec of blood and a little in the toilet...it was bright red. Mixed with like clear stretchy discharge. Very small amount and nothing else. Not enough to even fill a panty liner...and that was it. What do u think?? Is my chance of pregnancy slim?