The exact location of the aches was not given. If the pain is in the scrotum you might want to have an ultrasound exam. If the pain is near the base of the shaft of the penis, you might want to check for inguinal hernia. If the pain is more intensive when urinating, you might want to have a urine culture.
As for not getting pregnant your previous partners, there are many factors that have to be taken in consideration. You have to have intercourse on the exact day she ovulates which is easy to calculate for every woman. So, she might avoid intercourse that day on purpose. On the other hand, they might have been on some kind of contraception that you were not informed about.
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