Possible glass in foot?

I went to a wedding last week and, by my own fault, got a tiny shard of glass in my heel. I’m talking real tiny. I’m not sure it came out. I thought I had, but it still hurts to walk on. I walked a lot yesterday and it started bleeding and now the pinprick sized area is looking a little black. The only thing is I just started working any my insurance doesn’t start until October 1st. Is it safe to wait until then to see a doctor?