Kate Middleton has reportedly dropped a major pregnancy clue.

For months, there have been rumors that the Duke and Duchess of Cambridge are already expecting their fourth child. However, the palace has never confirmed it.

Just recently, their possible fourth pregnancy has made headlines again. According to Express, Middleton sparked pregnancy rumors after skipping the Kuwait and Oman tour with Prince William.

Last week, the future king flew to Kuwait alone for an official visit. Usually, Prince William and Middleton carry out royal trips together. So, many are wondering why the duchess didn’t accompany her husband.

Royal fans reportedly believed that Middleton didn’t join the official tour due to the travel health warnings in Oman. The Centre for Disease Control and Prevention recommends that pregnant women avoid the high risk area.

“Although the risk of malaria is low in Oman, you should avoid mosquito bites to prevent malaria. Some travellers to certain areas who are at higher risk for complications from malaria (such as pregnant women) may need to take extra precautions, like antimalarial medicine,” a post on their website read.

In October, Middleton accompanied Prince William on their tour to Pakistan. Many also suspected that the duchess was already expecting at the time because for the first time, the couple brought a tour doctor with them. There were speculations that they did it to ensure Middleton’s welfare while they were on tour.

Middleton’s first three pregnancies were not easy. The Duchess of Cambridge suffered from severe morning sickness and she was advised to take a bed rest. As a result, Middleton was forced to cancel some of her engagements.

However, a pregnant mom who is also suffering from the same condition claimed to have found a solution for it. Sammy Warnes, 30, said that smoking pot has helped her ease the condition.

Warnes has a daughter and is expecting her second child. However, her pregnancy was 10 times worse than her first pregnancy that she even considered to have it terminated. However, a couple of puffs of marijuana has enabled her to function normally again and she only does it a few times a week.

Prince William and Kate Middleton
Britain's Prince William and Kate Middleton are pictured on a five-day visit to Pakistan. AFP/Aamir QURESHI