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I just read what you posted while I was writing. If they're all 14 weeks old it sounds typical. Your roo-boy is ready to go but your girls aren't. So when he tries to mate with them they probably emit pathetic squawks & shrieks and struggle to get away. You may just want to separate him, maybe just during the days, for another 6 weeks or so. Or really, if he's not causing bloodshed, just let them be. When the pullets are old enough to begin to lay they'll be much more receptive & agreeable to his attentions.
I really don't think that early attempts at mating will cause a pullet to begin to lay too soon. And red spots in the eggs are NOT caused by roosters! They can be found in both fertile and sterile eggs. It's just a fleck of blood from inside the egg-making apparatus, often found in fresh eggs but rarely in store eggs because they fade with age.
So maybe your rooster does NOT have to go...