I wonder if I'm pregnant

I have had this brown, oderless, discharge for 2 days. I've been having headaches, sensitive/sore breasts, and mood swings. I've had 2 kids already so I know this sounds like pregnancy symptoms. I have not gained any weight, as a matter of fact I lost 2 pounds. I took a pregnancy test and one line came out real dark to say the test was taken correctly but the line that tells you if you are pregnant or not came out very faint but you can tell that it is there. It came out immediately after it was placed in the urine stream. I waited the alotted time given and it stayed the same. The line is faint and the area is pink. So I don't know if I am pregnant or not and I don't know how long to wait to take another one but I don't think I can wait that much longer. The wait is going to kill me!! I am not old enough to go through menopause yet.