I injected into my delt this morning with sus 250 and when i aspirated it didnt look like there was any blood, only bubbles. after takeing the needle out i noticed blood in the top inside part of the needle itself (the part that hooks to the syringe) my question is, did i not pull the plunger back far enough? and if i did inject into a blood vessel how long before i could see symptoms of this?? its kinda freakin me out a little, but i dont feel any different from when i normally inject and it was about an hour ago.