This may seem like a really stupid question but I am curious, is it okay to do the shot on the first day of your period? It wont do harm, right? I'm supposed to get my 6th injectin today.

do it regardless its fine.

I think any interfering it might do is the kind of interfering that you seek. 

I'm not a doctor, but I think it shouldn't matter what day you do it.

I got my second shot on the first day of the period, I don't think it's a problem. That was my last period 

I have done it, it doesn't do any harm. Generally I do my shot in my arm during that time, ask your doc how before you try it because with T you have to have a certain amount of muscle to be injected into. (I'm not buff my any means and my doc says its fine so don't think you have to have huge muscles)

I took my very first shot on the day of my period,
It didn't cause me any issue, and by the next day,
My period was gone until I had to stop my shots.
I wasn't warned about it. It shouldn't be a problem