I would think maybe you would want to stay away from it just in case there is a chance you are pregnant. You would probably be fine in the time between AF and ovulation but after that you may want to skip out
I found this article..... hope it helps =)
According to the Organization of Teratology Information Services (OTIS), a body temperature of 101º F and above can raise concerns during pregnancy. Some studies have shown an increased risk of birth defects in babies of women who had an increased body temperature during the first trimester of pregnancy.
The American College of Obstetricians and Gynecologists (ACOG) states that becoming overheated in a hot tub is not recommended during pregnancy. ACOG also recommends that pregnant women never let their core body temperature rise above 102.2º F.
Although the specific degree differs, both OTIS and ACOG attest to the concern related to hot tub use during pregnancy.
Hot tubs are often factory programmed to maintain a water temperature of approximately 104º F. It takes only 10-20 minutes in a hot tub to raise your body temperature to 102º F or higher. To maintain a steady temperature, water is circulated and re-circulated through the hot tub to pump out cold water and pump in hot water.
So, is a hot bath safer than using a hot tub?
A hot bath, which is not uncomfortable or scalding, is a safer way to relax. In a bath much of your upper body will remain out of the water, making you less likely to overheat. Additionally, the water in a bath begins to cool off, as opposed to a hot tub, further reducing any risk of overheating.