Implantation bleeding

Savannah

On the 18th cycle day 24 which is around 9/10 dpo I had what I thought was the start of my period, I wiped that morning and it was a red/brown color so I thought I had started my period about a week early (my cycles are usually every 30 days occasionally every 28 days like clock work. So this was odd for me. I put in my diva cup and at the end of the day took it out to find no blood and I haven’t bled at all since then. I’m now on cycle day 27, I took a pregnancy test yesterday morning and today and it was negative. I have never had anything like this before no spotting or anything. Do you think this could be implantation bleeding? How long did your implantation bleeding last was it similar to this? This is our 6 months of trying