just pinned Human Chorionic Gonadotropin (HCG) with a 29g .5" slin pin in my stomach for the first time. i'm shooting 50 units, about halfway through my stomache starts burning. i'm using bacteriostatic water to reconstitute. is this normal or am i just going too deep or not deep enough or what? and also, can you just use the slin pin, stick it in your glute without pinching the skin and still be injecting subcu because you're obviously not injecting IM with that short of a needle. or does it have to be the stomache? no broscience please.