Is it normal to have less of a sex drive before your period?

This is the week before my period. I normaly really horny during this time of the month...but I'm not this week. I still love my boyfriend but I just don't feel like it, I want to snuggle not have sex. I looked on the web & everybody says they are hornier the week before & during which is me but not this time. Should I worry? My boyfriend told me it's okay. I feel like it's not normal & not me. So is it normal? Does anybody feel like me? Haha.