Could I be?

I had a period jan 6th normal 5 day period like always. Well on the 30th i had light spotting and then a nother day with a little darker and then nothing else that was it. At first i thought it was my period but im like no i had my period for this month and this wasnt normal. since then i have had nausea back pain headaches, and just felt week so ive stayed in the bed somedays i feel great. Could this be possible pregnancy i mean me and my bf did have un protected on jan 17th but just on jan 17th. does anyone have any idea. thanks