Can pregnancy symptoms such as breast tenderness start in the next 10 hours after intercourse?

I HIGHLY Doubt it. 10 hours pregnant.. Your body wouldn't even know its pregnant yet! Which is why pregnancy tests don't work that early. The hormone, human chorionic gonadotropin (hCG), is detected in urine and bloodpregnancy tests. And that won't even show up for 3- 4 weeks after you've been impregnated. (Around the time you should be getting your next period)
So if you can't even find out you're pregnant for that reason, I doubt your boobs would be starting to produce colestrum (milk) that early to cause them to be tender. Takes a while for the body to clue in, so if your bobs are sore, its prolly from him playing rough. Hope that helps!