Uy, mama, puwede pang maging normal yan pero dahil pregnant ka na at 29 weeks na, mas better na check with your OB agad, hindi ako confident na mag-advise para dito kasi sensitive ang pregnancy. One of my mum friends din nag-swimming when she was preggy at may pains siya, pero seryoso talaga na kailangan ng doctor ang tingnan to be safe! Don't worry lang, alam nila ang gagawin, go see your OB soon, okay?