Can you have a BFP so light that you can't even capture it in a picture?

Rachael • Married to my wonderful wife, mom to D, twins on the way. lots of other roles and titles.
I had an Evap line on yesterday's test, but it's a pink Evap line on an FRER. I thought this morning's test was negative but it used the light on my iPhone to look again and I think it's a very very very faint positive. I tried to take a pic of it but it's so light I can't capture it. I'll obviously test again tomorrow but is it possibly positive? Has this happened to anyone else?

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