Glow keeps delaying the AF date

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So according to glow, my periods were due 28th June. Then when it didn't show up, i marked it as late period. It moved 2 days later, again no show on 30th n I marked again and now it shows 2nd July.

Im too scared to test n get bfn. I have no preg symptoms either.

What to do?? Wait a couple of days more to test???