I just did my second injection 500 mg test enanthate, now when I went to aspirate it seemed a lot harder then the last time and when I finally pulled hard enough the plunger went flying back like 1/2 a cc and then right back to the 2ccs. No blood came in and I think a little bubble entered the syringe. When I finally injected for some reason it was hard as hell to push in the juice, I think there was a little bubble in the top. Midway through I don't know if I got a spasm or if the needle moved to much cause it wiggled a little, but I had a rather sharp tight feeling for like 2 seconds. When I was done my ass started feeling tight and sore real quick and it looks like it's a little black and blue underneath the injection site. Did I do something horribly wrong aspirating, injecting, or moving the pin a little to much. I appreciate any help, and should I be worried that I hurt myself or hit a vessel or didn't effectively inject the juice?