Sis, pag ganyan ang nangyari, kailangan mong makita ng doctor na talaga para malaman kung ano ang nangyari, four days delayed with spotting ay dapat i-check agad, okay? Go to your OB or clinic as soon as you can para sa proper check-up at test if needed. Hindi kami dapat mag-guess on something like this. One of my mum friends had similar thing and it turned out she needed medical advice right away, so please don't wait further. Praying for you!