Light periods months after miscarraige

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Hi, I had a miscarriage at 11 weeks in December 2018. After that my periods were pretty normal, every 28 to 30 days and about 5 days each time. However this month and last month they have been so light that I've not really needed to use anything and only lasted 2 days! Pregnancy tests are negative. Has anyone else found that they have had normal periods after miscarriage for a few months and then it's all gone a bit odd! Thank you