Advil is a brand name for ibuprofen, which is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain, fever, and inflammation. According to WebMD [2], ibuprofen is generally not recommended during pregnancy, especially during the third trimester, because it may cause harm to the developing fetus. However, the website states that if necessary, a woman may take ibuprofen in the first and second trimesters, but only under the guidance of a healthcare provider. GoodRx [3] concurs with this recommendation, noting that ibuprofen should only be taken during pregnancy if the benefits outweigh the risks, and only under the supervision of a doctor.

Drug Patent Watch [1] provides information about the dosages and forms of Advil that are available, but does not offer any guidance on the safety of taking Advil during pregnancy. It is important to note that just because a medication is available over-the-counter does not necessarily mean that it is safe to take during pregnancy.

In summary, while Advil (ibuprofen) may be safe to take during pregnancy in certain circumstances, it is generally not recommended, especially during the third trimester. 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.goodrx.com/ibuprofen/can-you-take-ibuprofen-while-pregnant