Aw, first trimester talaga yan, mama! Ang dami naming kaibigan na nakaranas ng ganyan, yung weakness at soreness sa limbs, lalo na kung maraming hormonal changes happening sa katawan mo, kaya normal lang yan pero since you're a first timer, mas okay na i-check mo talaga with your OB just to be sure, especially kung tumatagal or nag-worsen pa, okay?