Can I be pregnant ?

Hello. I am 24 years old my fiancé and I been trying to conceive for few months now. I am regularly with my period and the last time I had my period was October 21st. (Normal) Now as of November 25th I still haven't received anything; as I follow this app and another I was suppose to get it November 18th and end around now. I haven't changed anything in my diet nor am I taken any medication to have it delay in any sort. How ever I have been cramping but it doesn't feel like period cramps, and I also spotted around the 20th of November & that's all after that. My breast feel extremely sore when I rub against anything & I've noticed that I been using the bathroom a little more then usual . I am a bit scared but exicited at the same time. Am I just over thinking it or can I really be pregnant. ???? Please help!