Possible pregnancy or just period?

Hi. I’m new to this! First post. My boyfriend and i put in extra effort during my fertility window / ovulation day in January (22-27th) and my period is due tomorrow. For the past three days, i have had light cramping. Today i have been cramping and (TMI PHOTO attached) some possible pinkish when i wipe. But i am not flowing like a regular period. I also have felt nauseous the past 30 minutes (normally my period doesn’t make me feel like throwing up). Am also having a headache. Could this be implantation or just my period coming / starting a day early??