Hi mama, it's good na active si baby pero yan na ligtas sign, pero ang persistent na sakit sa side mo especially na nahirap kang maglakad talaga ay kailangan i-check with your OB agad, could be round ligament pain which is normal sa pregnancy pero importante ma-rule out din kung may iba, kaya huwag mag-self-diagnose lang. One of my mum friends had the same thing at dinala siya ng OB para ma-assess, at naging okay lang after some rest at prenatal massage, pero kailangan talaga ng checkup para sure, mama! Wag mag-atubili na tawagan ang clinic mo para peace of mind mo at ni baby. Sending you good vibes, first-time mom!