Pelvic pressure while walking

I am 5 months pp, but still I feel pelvic pressure when i go for a walk. I am otherwise active throughout the day doing household chores and handling baby.. i don't feel any pressure otherwise. But if i take a half an hour walk in the park, thats when i start feeling vaginal pressure which then haunts me during walking, sitting or standing for the next few days.

I was hoping to start running in some time to loose the pregnancy weight but this pelvic pressure is really killing me. Is it something serious. Should i consult my gynae.