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Go get some probiotics!! Seriously, they saved me in my pregnancy. It regulated me, and they went away. I didn't have to strain, and they weren't "football" like. AT any vitamin store, get them from where the refrigerated vitamins are. Keep taking them daily after the birth, too...it still helps then. In addition, eat yogurt with "live, active cultures." You won't regret the probiotics, I promise!!
The reason it starts when you have regular bowel movements, is all the straining you did BEFORE...to get out the hard ones. The hemorrhoids are a result of that, not from the regular bowel movements.