A positive then negatives

So I took a test 2 days ago and got a faint positive and I've been testing since to be super sure and I've not had a clear positive since? Ive either had super faint positives, like barely noticeable, or negatives? Is it possible this was a false positive? I'm also 17 days late

This was my positive

And here are the ones I've done since

Thank you for any replies in advance 🩷