Bleed on my boyfriends sheets?

I feel so so bad, he planned a whole weekend of things to do and now he's kinda mad. My periods are irregular
so I woke up this morning and it looked like someone was murdered on my side of the bed and he loves to cuddle I even got blood on him. I cleaned it up and said sorry. He did get slightly angry and hasn't really said much to me today. Has anyone else had this happen? Do guys get over it?