It might be useful to keep track of the dates when they occur. If you end up needing to see a doctor about it, it might be useful for them to know whether they fit the timing of a menstrual cycle.
Worth keeping an eye on it, i imagine you still have your ovaries if you suspect it's menstrual symptoms? If so, the symptoms of a lot of other problems in your remaining female organs are ususally distinctive, but ovarian cancer symptoms can be very vague, i'm probably a hypochondriac for even thinking of it, but anything unusual is worth asking a doctor about.