Implantation or period ?

Well for starters , I’ve been having irregular periods. I had sex on the 31st and on the 1st . I took a plan B on the 2nd . It had already been a lil more than 48 hours from the first time I had intercourse and taking the plan B . I had very mild cramping on the 11th and small drops of brown and when wiping it was still very light brown . Yesterday (12th) was the same but had a little pinkish once in the afternoon. Today I have been having a little more light pink/light brown bleeding , and a lil cramping in the morning but haven’t had any since. What are your thoughts??

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