Possible implantation?

Today makes 14 days since sex. My periods are irregular so I can't track that way.

I just started spotting light brown & have had some nausea and light cramping today. Could this possibly be implantation bleeding?

Today would only be 25 days since my last cycle. It could be AF starting but I've never had a period this early. My period is usually anywhere from every 30-35ish days.