That's normal. Everyone is a little different and has a different sex drive. Some women get very in the mood when they are on their period, while other women don't. Neither is abnormal by any means. Since women have a cycle, it isn't unusual to notice periods of time where you are more in the mood or less in the mood, but exactly when that is is bit different for everyone.

Unfortunately, you don't have an option on there for "it's normal for a woman to be less interested in sex during any time of her cycle" because that's the right answer!

personally, I get horny before and during my period. But that's just as normal as becoming less interested in it.

a day or 2 before and a day or 2 after my period is when im most horny