Possibly Pregnant - help

I am 17 years old, and I think I am pregnant. My SO and I have religiously protected sex, but I recently went off of the pill about 2-3 months ago. I wanted a break from it, as it makes me moody. I haven't gotten my period yet. My last period was on May 15th, and lasted about 5 days. I am a couple days late, and have no symptoms.

Can you please tell me what the very beginning of your pregnancy was like? How can I naturally induce my period? When should I begin to worry?

Also, please do not post comments referring to my age and how I "should not be having sex if I'm not prepared to have a child." Many of you have had sex when you too were unprepared for a child. I simply seek guidance.