Hi welcome to the board.
I will get straight to your fears. So listen we all have gone thru this when we were new at it. I'm talking about your fear that this was not normal. So right off the bat the bleeding a drop can happen often. During my Quad and a glute injection the blood squirted out like squirt gun. Just one squirt. Those two times I believe I nicked a vein or when thru one. Not a problem cause there is the normal BP and a slight vacuum so it followed the needle out.
Let me explain and i will try to be brief, Not only are there veins but there are the capillaries and we are piercing them everywhere when we get punctured by anything, right ? Well they usually do not bleed much. Look at the Glucose test on your finger tip. Just think how you bleed a drop when stuck by a tack or a shallow cut. those are capillaries.
Simple !
Now when we do IM injections we are going in at a 90 degree or close to the veins. TO IV you go as close to parallel 20 degrees
but so, entering the needle can slip into the vein and with a VERY STEADY hand stay in the vein during the entire injection. Many time IV injections will bleed a little like when having blood draw and they wrap the piece of gauze on it. SO a FACT is that it is very difficult to stay in the vein. A minuscule amount of movement and you are out the other side or the side of the vein.
Now we got blood.
In the case of IM you would have to blindly enter a vein and be steady enough to STAY in...
I tell you from almost 40 years of experience you will not stay in. Haven't you had a nurse miss and more then once while taking blood. Hell they are watching and propping on something to stay steady etc... Also and any amount of Oil you get into the vein will not bother you. You will never get more the a very small amount. I've seen this and i have experienced this. Others might as well tell you that they have had the same experience. So do not worry.
Now as for aspiration it is purely your choice. But as i tell you it is a waste of time , for some people, nerves and others they are too shaky. Then you have the false alarm. YOU see a tiny bit of blood and panic and pull out... While it could have been several capillaries bleeding together to give blood a bit enough. . Or the vein however I tell you most probably would not get much blood to fill because by then you will be out of the vein. IN doubt just move that needle and you ARE OUT just that simple.
I myself use a 23G x 1" I will draw with the 23G it's a little slow , I don't care. . Then I use the same 23G and inject. This I've done for YEARS. I do like a 25G x 5/8"for pectorals.
I myself do not like Quads they always bleed, the left always more. Only if I puncture more then 2 Vials do i then change the injecting needle to a new point. Listen i have two daughters that are RN's a niece is an MD, my father an MD years ago he injected us very often at home they all agree NO Aspirating they do not teach it in the RN's schooling anymore.
Oh well I tried to be brief
but they know me here.
Good Luck, OMM
PS:....
I am not a doctor. OMM