swollen shot

hi everyone, probably just panicking because this is only my third shot (my first i swear I couldn't walk for a week)

but I did my shot 2 days ago and the area is swollen and hard underneath, about 2 inches? in the direction i did the shot. its a little warm but doesn't really hurt unless I press on it (ive been trying to massage it)

is this a bad sign or just normal.

thank you!