5-6 days early

Regency
Soooo I've gotten a couple of vfp test late last week and I was thinking this was our month. Then my period started (or what seems to be it ) 5-6 days early. Usually I'm like clockwork when it comes to my period.. last month it came 12/24 and its been that same date since as long as I can remember. I was so off guard that I didn't even have any undies on 😏 and didn't get my normal pms lol. I went to bathroom wiped and saw it yesterday was bright not red just bright pink now not a lot of bleeding like I normally have, and is turn brown. Started yesterday. They normally last 4-5 days doesn't turn brown till the end.. soo hmmm I'm confused.. could this implantation bleeding or regular period.. and when is it ok to test again? Has anyone experienced this?