Maybe Pregnant. help ??

I'm 16 and me and my boyfriend have been together for over 2 years now. We have recently started having sex and have never been happier or closer. I went to have my period (I am always right on time and regular) but it never came. I spotted for 3 days (VERY light) and then nothing. I talked to my mom and she says I may be pregnant. It's been exactly one week since, and no period. Any thoughts on if I may or may not be pregnant?? I'm getting tested Monday.