Though these symptoms are quite frequent, they shouldn't be ignored.
Irregular bleeding between menses may be due to many reasons: cervicalpathology, polyps in vagina/cervix, urinary conditions, etc. Based on your periods coming 27-37 days apart, it's also possible that you have some hormonal disbalance. In order to sort this out you should see you Gyn for physical, possibly PAP smear, blood work
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