Most essential oils have the function of dredging menstruation. If you rule out the promotion caused by other reasons, that's why you promoted. It's okay. You can use it safely. But you should pay attention to the way and dosage of use.

Lavender can be used directly, and the daily consumption is generally within 5d, 1ml=20d. One-time use is generally within 3 d. I don't know what effect you want to achieve by using it in the abdomen, but it is not recommended to use it directly because of the large area of the abdomen. You can buy a bottle of base oil to adjust it. It's much safer this way.