Confused - Implantation Bleeding?

So this morning I went to the restroom and when I wiped I found a small dot of bright red blood, almost the size of a normal pin head. 
AF was supposed to start the 24th according to Glo, but no signs of her. I have been very gassy for the past 2 days (sorry TMI) and my lower belly feels funny. It starts just above my naval and just below. It feels like a slight stretching/bubbly feeling. I can't tell if it's gas or not.
Has anyone experienced this? If so, should I be expecting the lovely AF or a bundle of joy?
If it is implantation bleeding, when should I test if AF never comes?

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