Pregnant?????

I think I'm pregnant but then again I don't. I'm 2 months late on my period. It is July 11th and the last day I was on my period was May 13th. I had sex 2 months before that and 1 month after. Unprotected. I haven't had any morning sickness and I don't feel fatigue at all. I put my urine in a cup and left it over night and in the morning it had a clear film on top and white substance in the middle. When I urinate, it bubbles on top of water in the toilet. I'm scared I might be since I am only 15 and I'm on my 3 or 4th year of having my period