The best replacement for ovum is oocyte.

The best alternatives to ovum are rated as following:
★★★★★  oocyte
★★★★  egg
★★★★  ova
★★★  molar pregnancy
★★★  sperm
★★★  anembryonic gestation
★★★  egg cell
★★★  gartner
★★  chemical pregnancy
★★  secondary oocyte
★★  early pregnancy
★  too early
★  ectopic
★  missed miscarriage
★  sperma
★  molar
★  ectopic pregnancy
★  ovary
★  ovulated late
★  zygote
  missed abortion
  twins
  hydatidiform mole
  tilted uterus

Your alternative for ovum is not listed? Suggest!
Speaking about ovum, one probably shouldn't forget about high hcg levels.

Other search terms related to ovum and their ratings are:
★★★★★ high hcg levels
★★★★★ yolk sac
★★★★ sperm
★★★★ pregnancy symptoms
★★★★ yolk sac present
★★★ fetal pole
★★★ no bleeding
★★ rising hcg levels
★ morning sickness
★ yolk
You have in mind a companion for ovum and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of ovum in all years. Click on graph for more.
ovum
oocyte
egg