Oo, pede naman magswim sa first trimester, marami sa amin nag-swim throughout, it's actually relaxing and good for the body! Just make sure the water is clean (chlorinated pools are best), stay hydrated, and listen to your body, kung pagsisikapan mo or nag-mamaliit ka, stop na talaga. Best pa rin to check with your OB first para ma-clear especially if may complications ka or anything unusual na naramdaman mo, pero generally okay lang swimming habang buntis.