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"I went on this jab when I was 18 back in July 2008 to stop me getting pregnant (me and my boyfriend don't want kiddies yet) and it'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's ok. I've only had a few side effects.. I get headaches sometimes, I'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's ok.. I don't like the periods that come and go but never mind.. it works wonders!"