Spotting, then BFN, then nothing??

Lillian • Baby boy born October 2018 ❤️ Pregnant with baby #2- due May 2022 😍

So we’ve been TTC for baby #2 for two cycles now… my period was supposed to begin yesterday or today, and starting yesterday morning I had extremely light spotting and by the end of the day the spotting stopped entirely. This morning, again, nothing. I’ve been feeling nauseous off and on since two nights ago, had bad lower backache and some mild stomach cramping that’s mostly stopped now… I took a pregnancy test yesterday as well and it was a BFN. Is it maybe too soon to test? Could this be implantation bleeding or just a wonky period? Of course googling the symptoms just makes me way more confused. Has anyone experienced this and what was the outcome??? Help!