Advil is a nonsteroidal anti-inflammatory drug (NSAID) that contains ibuprofen as its active ingredient. It is commonly used to relieve pain, fever, and inflammation. However, when it comes to pregnancy, there are concerns about the safety of Advil.

According to WebMD [2], pregnant women should avoid taking Advil during the third trimester of pregnancy, as it may cause harm to the fetus. The use of Advil in the first and second trimesters of pregnancy is still controversial and should only be used under the supervision of a healthcare provider.

Advil's official website [3] also states that pregnant women should avoid taking Advil during the third trimester, and it should only be used during the first and second trimesters if directed by a healthcare provider. The website also advises pregnant women to consult with their healthcare provider before taking any medication, including Advil.

Drug Patent Watch [1] provides information on the patent status of Advil but does not provide any information about its safety during pregnancy.

In conclusion, Advil should be avoided during the third trimester of pregnancy. Its use during the first and second trimesters should only be under the supervision of a healthcare provider. Pregnant women should always consult with their healthcare provider before taking any medication, including Advil.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.webmd.com/baby/pain-relievers-that-are-safe-during-pregnancy
[3] https://www.advil.com/advil-safety/advil-and-pregnancy/