Men’s reaction to your period - need advice !

Soooo my boyfriend and I have been together for two years , we have one child together, I have one before him and he has two before me .... today my period started a day early and we woke up this morning with a few spots of blood in the bed we share. As soon as I saw it I told him and got up to clean myself and the sheets, while I was doing these things he’s going on about how disgusting it is and keeps saying “are you serious, are you kidding me” my feelings were really hurt that he was behaving like a teenage boy and I told him this, he responds that I’m just embarrassed and it’ll be okay. Am I overreacting ?