Rols - My MIL is a nurse and she did our trigger injections and when the fertility clinic heard she was a nurse and doing our injections they purposely pointed out that whilst the box says intramuscular we were to take it subcutaneously. And all three times ive had a trigger (and one of these was given by my FS herself) these were straight in the tummy (which isn't very muscular hehe). I would definately check with your fertility clinic to make sure. Hope this helps