I got the shot when I was on the third day of my period.
30 Sep 2013
Checked the manufacturer's website (Pfeizer), who state:
'First injection: To provide contraceptive cover in the first cycle of use, an injection of 150 mg i.m. should be given during the first five days of a normal menstrual cycle. If the injection is carried out according to these instructions, no additional contraceptive cover is required.'
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