Hi ! Even with all the precautions, there is always a chance for infection, and possibly it is a pelvic infection
this time. This will give rise to pain in the lower abdomen. The soreness of the breast and feeling hungry might be a co incidental without any relation to this as it is too early to diagnose a pregnancy.
Right side lower abdominal pain
could be due to a co existing sub acute appendicitis
, or salpingitis
, or a urinary tract
infection/calculi. If the syptoms persist, or increase your discomfort, I would suggest you to rather get yourself reviewed by your family physician.
Wishing you an early recovery.