maybe it's just girl cum? i don't really know britania, but maybe you are just "extra wet" around your period. i would imagine that if a doctor looked at you and checked you out that you're probably just fine!
women's hormones change over time. probably where you are at this stage in your life, you probably just have the right mix of hormones to have a little extra discharge.
as much as it "disgusted" your boyfriend, evidently it didn't keep him from enjoying having sex with you...so that's not a problem.
don't be embarrassed by it. it's just your body acting naturally.
jasmine