help:(

I got my period last month on Dec. 11 but it never is to normal but only ever misses by like a day or two. I’m not on birth control and we use condoms, except one time on Dec. 29 but he didn’t finish. Today is the 17th of Jan and still no period!! I have cramps and my boobs are a little bit sore. I’m going crazy. I have also been really stressed. I need advice please