Pregnant or not pregnant?!?

I am 19 years old. The last time I had my period that was normal was in feburary. March I had a period but it only lasted a day, ever since then I haven't started. Well I took a pregency test in march (negative). Then I went to the health dep. And took another one beginning of April (negative). I have another appointment with them this tuesday. Well today I had a feeling to go and take one, I used first response by the way, and It came back positive ( one dark line and lighter line next to it). Well I took another one which was from the dollar store for a dollar it came back negative. Well then I went back to walmart and just took another one (clearblue) and it came back negative and I also used my first morning uruin. I don't know if this means anything but a couple of weeks ago I discharged a very white like egg white cemun what could that be????. It was kinda stretchy like. Any opinion anyone? I am really worried. Thanks!