I don't think this is a silly reason to see a doctor, and the Marines aren't paying health care for you yet?
Without a thorough history and exam, and possibly even a hormone level, it's not really possible to guess online. BC pills are hormones, and do tend to even ours out when they are low, uneven, or fluctuate more than usual. Cramps are common with heavy flow, and pelvic tilts help a lot, along with warmth applied to your abdomen. Maybe your age or maybe the exercise jolted something in you to get your periods going for real, and they will even out and slow down as they do in many of us as we age.
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