I am in some serious need of help!

I had my last period February 21st. I started spotting on March 22. The spotting lasted four days, until the 26th. A week and a half later still no period? I know it was spotting, or at least it wasn't a period. I wore tampons those four days because I was in class all day and I would rather be safe than sorry, and every time I took it out there was either NO or MINIMAL amounts of light brown stuff on it. Me and my boyfriend have never had unprotected sex, and I'm not on the pill or anything (yet.. I have a doctors appt to get BC on the 15th). So our only form of birth control as of right now is condoms. I took two HPT's and they were both negative about three days ago... any ideas on what this could be?

Your menstrual cycle can change with increase stress levels, as we age, raging hormones, you name it. Spotting, light periods for one month; gushing 8 day period the next. Mother nature is a curious woman. I would be willing to bet that those 4 days of light spotting were your menstrual cycle for that month. You've done the best thing and protected yourself by using condoms, and also taking a home pregnancy test.
If those 4 days were not your period and it's truly been a month and a half since you last period, a pregnancy test should pick up the hCG hormone in your urine. (If you were indeed pregnant).

My suggestion? Keep your doctor's appointment and most likely they will do a pregnancy test there. If they don't collect a sample, ask them to. :)