Well, if there is an upcoming procedure, it's not necessarily tomorrow. He worded it that he'll probably have his date for surgery tomorrow. I'm interpreting that as finding out the date that it would be, several weeks/months/whatever up the road.
As for the bruise, not everyone gets their bloodwork or the IV right in the inner elbow. It depends on several factors like how shitty your veins are, where your "good" veins are, how dehydrated you are, how deep your veins are, how much scar tissue is on your arms or how fat your arms are, etc. So while the preferred spot is the inner elbow, if that spot is a shitty spot for that particular patient and a good vein is somewhere else, they'll take the good vein somewhere else.
If you want to avoid a big-ass bruise, keep your arm straight afterwards and apply pressure. Everyone wants to bend their arm after bloodwork but if you do you're just holding that vein open.
edited to add: also sometimes bruising isn't at the exact same spot as the needle went in. I know it sounds weird but blood can definitely pool and accumulate in strange ways.