Reply to 5 days late and negative pregnancy test

So my first thought is that could be implantation bleeding. I just googled and it said it can take 2-3 days after implantation bleeding for there to be enough hcg for the most sensitive test to detect a pregnancy. So if you spotted for 2 days and you tested on the 5th day... that would be the third day after implantation bleeding I think. Unless they count the first day? 🤷🏻‍♀️ I would try again tomorrow or maybe the next day. Doesn’t hurt to call your drs office for a health professional’s answer about this though.