Injection site and bleeding?

I’ve been on Tirz for a little over a month and have only injected into stomach and arm once. I tried my thigh this time because I was upping the dose a little. I sat down and pinched the top of my thigh - however I have more toned thighs compared to the rest of my body so this was a bit hard. However, instantly after injecting it started to bleed a little bit. I’ve never had this happen before? Is this normal or is the medication wasted?