This action *should* activate the safety mechanism that pops a clear cover over the needle. It took me 2 weeks of
injections to realize this existed! 40mg is a small dose so I don't think it would cause reactions, but I'm not a doc or pharmacist so if it keeps up you should definitely ask one of them about it.
By the way, I checked on the Heparin recall and it was by Baxter and only for certain dosages and vials.