Implantation or spotting before period??

I should’ve kept temping consistently but I do know that my cover line in the past has been 97.7. I’m missing a couple temps and the opened triangles were actually taken 2-4 minutes off. I had some very light pink in my discharge today only once and my temp went right under what should be my cover line(97.7). I think I ovulated on feb 7th-10th I’m not sure....one app says I had suppose to start today, another app says I start in 4 days. What do y’all think? Is it implantation or spotting before a period? I don’t really spot days before a period but my body changes so I don’t know what to expect each month.