Ay mama, ganyan talaga sometimes after breastfeeding stops, ang cycle natin parang nag-adjust ulit kaya kakaiba ang dating, lalo na if you had irregular patterns during bf! But seven days of spotting pa rin is a bit unusual for you if you're normally regular, so I'd really suggest checking with your OB just to be safe and get your mind at ease, could be hormonal adjustments pa lang, pero better to confirm na especially pag di mo pa na-experience before.