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Hi learningtolive, I had a similar experience although I 'think' mine may be for different reasons. I have had surgery on my left knee back in the early 70's when doctors did not have knee replacement experience that they do now. My lower outside thigh ligament was removed in order to place into my knee for its stabilization. During my second or third injection using this leg, when I aspirated prior to injection, blood came into the syringe barrel. I pulled out, disposed of that dose along with that syringe and started over. It bleed alot and took some time to stop. I believed this happened because the surgery allowed access to a small vein that ordinarily couldnt be reached.
It wasn't until the second injection though that I realized just how low down my thigh I had injected (nervousness replaced caution I guess). Reading your post my experience may have been normal. I have been injecting over 5 months since this happened with no problems.
Ii is very important to talk to your doctor and watch some videos and reserve judgement until you have viewed enough to know the ones who are not doing this right. Study some anatomy pictures and diagrams that have a fair bit of detail.
Just a very general idea is about 5 or 6 inches below an imaginary line at crotch level slightly on the outward side of the thigh. Second, once your satisfied the needle is at the correct depth, aspirate (pull back on the plunger) until you see an air bubble, then the chance of being in a vein or capillary is eliminated, this is another reason to speak with your doctor as some now believe aspiration is outdated. Be Safe. Dani