cramping in lower abdomen, pain in lower back, tiredness, constipation, headaches, pain during sex, swollen stomach, bloated! i feel awful!

i had all of these symptoms when i was pregnant, but had an abortion as im only 17 and not in stable enough relationship. so i went on the contriceptive rod, but had it taken out 3 months later as it didnt agree with me. been using withdrawel method for around 3 weeks, but it can be that im pregnant again can it? im so worried!! some1 help please! me and boyfriend have both been tested for any STD's and come back clear?

having sharp pain in my bum too???? so embaressin but really painful!!!!

some1 please help x