Paano mo masasabing healthy si baby inside the womb?

First time mom po ako at 4 months po along preggy..I was just wondering paano mo malalaman na ok Lang si baby ko masyado po Kasi akong sakitin..I meant morning sickness po..parami po masama pakiramdam ko..parati akong nasusuka at pagod kahit wala nman akong ginagawa.