Implantation or af?

shinabhfuil • Married Aug 2018, Our 🌈 Baby was born July 23rd 2019, Pregnant with Baby No.2

Have had brown light spotting since Saturday evening (its now Monday evening Irish time), very tender breasts and frequent urination. . . This is first cycle after a chemical pregnancy, af is not due for another 3 days if my cycle is still regular, all pregnancy tests are bfn even first response early test. I am 14dpo. Trying not to get my hopes up but does this sound more like af or IB?

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