16 & PREGNANT?... HELP??

SOOO I'm turning 17 in February and the love of my life is turning 19 in April.

He is in the Army, and is home for the holidays (he leaves tomorrow, when I go back to school).

Long story short, we got down and didn't use ANYTHING (birth control, condoms, etc).

I'm supposed to start my period like, today, but obviously I'm worried I'm pregnant. (It also should be noted that I have a pretty irregular cycle.)

I am cramping, so I'm sitting in bed with a heating pad and "my" baby (long story, deadbeat aunt. my princess is 13 months 💖)

I needed to vent and I'm sort of looking for comfort because I don't want to scare my family for nothing.

I know I would have an amazing support group and I know for a fact that my Army boy isn't going anywhere. I just don't know if I could really be pregnant. It seems so far fetched and fake, but there's always a chance...