"I went on this jab when I was 18 back in July 2008 to stop me getting pregnant (me and my boyfriend don&#039;t want kiddies yet) and it&#039;s not a bad jab actually.. of course you have to give it 2 weeks for it to kick in after your 1st jab, but it&#039;s ok. I&#039;ve only had a few side effects.. I get headaches sometimes, I&#039;ve put a little weight on (not too much), a few spots and my periods are affected.. my last one lasted 36 days and it finished yesterday thank goodness!! So it affects different people in different ways and I had another shot yesterday. So it&#039;s ok.. I don&#039;t like the periods that come and go but never mind.. it works wonders!"