18dpo, do I still have a chance?

I'm 18dpo and AF is 5 days late! I had a really vivid dream last night about getting a blazing positive, and I hope it's a good sign and maybe I'll get my BFP. Should I test again? I tested at 15dpo and it was negative, but I swear I saw an evap or vvvvfl. Advice?

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