So confused! BBT - Can someone please help?

I’m so confused. I am currently on CD8 and finished my period on Saturday. I took an opk test on Saturday and it was negative. I’ve taken another test this morning and it looks like it’s getting darker?? The thing is, I normally have a long luteal phase of 19 days, so to get a darker opk 2 days after my period ends is completely out of the ordinary for me. My cycle is between 30-32 days but has been messed up a bit since I stopped breastfeeding my son last year. This is my bbt chart.

What do you guys think? Shall I keep testing? Is it possible to get dark opk’s 2 days after a period? How long would your cycle be if you were to get a positive opk a few days after ovulation?