pregnant?

okay. I took the two clear blue test 2 days before AF. I was on medication for an infection. so I went to the family doctor to make sure it wasn't a false positive. he gave me a urine sample there.. that came back negative. so he sent me to get a blood test . it came back a 25. I have been taking the dollar tree test. but the lines are faint. I am now like 1/2 days late. I'm going back in two weeks to check the blood work again. Are the lines to faint? do I have anything to worry about? or just going crazy?