Am I being too much by refusing to send my boyfriend an uncomfortable pic?

My boyfriend told me that he doesn't know what period blood looks like and asked me to send a pic (yes, a pic of my period blood). It was my second day and I was having cramps, plus this was extremely strange and uncomfortable for me, so I refused. He then said that he should know what it looks like, and I told him it's literally normal blood, nothing special. He then gave the explanation that if he's gonna marry me, then info is needed, and that most guys would consider it hideous. He also said that if we have a daughter in the future, then he would like to be an informed dad to her. I was confused, very much uneasy and refused to send. He's still pestering me about it. What do I do? Am I being too much?

Am I being too much by refusing to send my boyfriend an uncomfortable pic?
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