Think I had a short LH surge?

I took a test on day 17 and it was pretty dark but not blatantly positive. I just can’t tell if I should consider that to be the day I ovulated. I took a test today and there was barely any line at all. Do y’all think I had a short LH surge and the 17th was probably the day I ovulated? I’m new to these so trying to figure them out! Thank you!