Implantation or overthinking?

I believe I am a few days late of my period but it is typically very irregular. I just started lightly spotting today and I’ve been having normal period symptoms such as cramps and lower back pain. Nothing out of the ordinary other than the spotting, no nausea, headaches, or fatigue. My sleep schedules been a mess, I typically don’t sleep much and I’ve been very stressed out lately. I can’t tell if it’s implantation or just my hormones fluctuating. Does anyone have an idea of what could be going on? I don’t typically spot before periods but I can’t tell if I’m overthinking it.