Confusion- When to test

Jodie • IVF warrior - Expecting our rainbow April ‘23🌈🌈🌈

I’m really struggling to understand my cycle at the moment. I finished my period the 26/12 on CD 7 come CD13 I had started spotting for two day even tho I wasn’t due to ovulate until CD17 and now I’m on CD 22, supposedly 5 DPO, feeling nauseous, heavy and achy. Is it possible to ovulate 7 days after finishing your period and could my spotting potentially be implantation?