Generally speaking, olive oil for pregnant women will not cause allergic reactions, because olive oil is a natural edible oil and is safe for most people. Of course, everyone's physique is different, and individuals may be allergic to olive oil, but this situation is relatively rare. If you are using olive oil for the first time, or have a history of allergies, it is recommended to test it on a small area of skin to ensure that there are no adverse reactions.

As for the effect of olive oil on the fetus, there is generally no problem. Olive oil is rich in vitamin E and healthy fatty acids, which is good for pregnant women and fetuses. Vitamin E can help maintain skin elasticity and health, and contribute to the development of fetal nervous system. Healthy fatty acids are beneficial to the heart health of pregnant women and can provide necessary nutrition for the fetus. Therefore, moderate consumption of olive oil is beneficial and harmless to pregnant women and fetuses.

Pay attention to the proper amount of any product used during pregnancy. Olive oil is a high-calorie edible oil, and excessive intake may lead to weight gain and other problems. Therefore, the proper amount of olive oil can be used in pregnant women's diet without excessive use.

It is usually safe for pregnant women to use olive oil and will not cause allergic reactions. Proper intake of olive oil has no negative effect on the fetus, and even contributes to the development of the fetus. However, everyone's physique is different. If you have a history of allergies or are using it for the first time, please test it first to ensure safety. Also pay attention to moderate intake to avoid excessive intake of high-calorie edible oil.

I hope the above answers are helpful to you!