Can your lh surge be less than 5 hours?! Im so confused

Nikki

So I took opk last night at 8, negative. This morning at 8 negative. Today at 1:30pm positive, today at 6, negative. Can a lh surge really be that short? Also, no ewcm and no usual ovulation symptoms like sore breasts. I’m on day 20, I have a longer cycle and on my fist round of 5mg letrozole, I did 2.5 last month. Thanks in advance!

Today at 1:30

Today at 6:

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