Painful Enbrel Injections - Any Tips?

So, I’ve been on Enbrel for about 6 months now using the AutoTouch injector with cartridges, and I’m just the last month or so, I’ve had one or two of my injections be painful, and/or bleed. It’s never more than a few drops of blood, and pain is gone once the injection is done so I’m not super worried, but does anyone know what I might be doing wrong? This never happened before, and I haven’t changed literally anything. Previously I always had a drop of injection fluid left on the injection site, which I was also trying to figure out why, but that seems better than this???? I think??? Any tips/advice/insight on technique with these auto injections would be super appreciated, because I’m at a loss and can’t see my rheum until mid February.