Pregnant Maybe and I'm Scared

I'm 17 and I recently lost my virginty like 2 weeks ago. I've had unprotected sex 3 times since then and I haven't been on birth control for at the most 2 months. My period was suppose to be here on the 25th and it's the 29th, so it's MIA. I'm freaking the hell out and my boyfriend is acting calm but I know he feels the same way I do. He's 17 as well. Some one pleeeaassseeeee help me and give me some advice!! Dear God pleeeaassseee!!