The Duke and Duchess of Sussex are now in the midst of their first royal tour together, arriving in Australia early Monday morning.
The Zika virus is a mosquito-borne illness which is spread via the Aedes species.
A potential effect of catching Zika while pregnant is the birth defect microcephaly - when babies are born with abnormally small heads and abnormal brain developments.
Pregnant women are now being advised not to visit Tonga or Fiji because there is still a risk of catching Zika virus, which can affect the development of babies in the womb.
Here's more CDC recommendations for protecting yourself against Zika during pregnancy. "It is important to know that there is neither a vaccine nor prophylactic medications available to prevent Zika virus infection", fertility specialist Zaher Merhi, MD, FACOG, HCLD of New Hope Fertility Center in NY tells Prevention.
Harry will carry out a couple of solo engagements in Suva, Fiji during the visit. However, it's very likely they are taking precautions.
The trip is raising some concerns as doctors advise that women like Meghan, who is 12 weeks pregnant, should not travel to areas that pose risks of Zika infection.
There is no risk in Australia and New Zealand - however, Tonga and Fiji both have a moderate risk of the bug according to government monitoring. "It is important to ensure protection from mosquitoes throughout the entire day by wearing long-sleeved shirts and long trousers", he explains. "But many decisions that arise during pregnancy are for the pregnant woman, her partner and her OB or midwife to make".
Have you ever cancelled travel plans because of a pregnancy? Zika can also be transmitted through sex without a condom with someone who was infected by the virus, even if that person does not show symptoms of Zika.