Hi, I've done 12 Mounjaro injections and the first 10 were fine I didn't even feel the needle. The last two which are a new pen suddenly really hurt. It's almost like they are blunt and I have to really stab them in my skin. Just done my 12th about 20mins ago and I can feel it still in my leg now. It's really strange. No skin reaction last time and only a tiny mark last week small bruise but no worse than the previous times. Not sure what's going on. Anyone else had this? I always alternate so last week did stomach, today I did my thigh.