This month my period wasn't normal. I get my period on the 10th of every month. I bled kind of light and lasted only a couple days and that was it. My period is usually very heavy and lasts a week or more. But in December my period was normal. I was having unprotected sex from about the middle of November until the beginning of December. My breasts have been sore lately and I been getting weird pains in the lower part of my stomach. Idk what this means... am I pregnant

You could indeed be pregnant. Some women experience implantation bleeding around their normal period date. This blood is often darker in colour but not always. Along with implantation bleeding some women also experience abdominal pain due to the implantation itself. Often this can be mistaken for just a light period with period pains. Bearing this in mind and the soar breasts I would say there is a chance. If you are pregnant you will roughly be about two weeks and this doesn't
A always show up on a pregnancy test.

Try get in to see a doctor to confirm then you will know sooner rather than later. Good luck x