Hello, ive been on the birth control injection since May the 3 months injection, i missed my injection on the 15 November nd since then ive been having unprotected sex since then nd b4, the last time i had sex was December 20th nd last week i felt i felt a pain , pintching feeling on my nipples nd my tummy has been feeling bloated today i hve white tiny pimples on my nipple nd my lower back pain is hell sour could i be pregnant? Im aslo unrinating quite often