AF late but many BFNs

[Suzie87]

Hi Ladies...not currently TTC so I dont really track accurately. My last AF was 3 Feb and I had unprotected sex on 19th Feb..he did pull out but im fully aware that is not always effective. I took the morning after pill on 21 Feb and now AF is approx 5/6 days late. I have taken 6 (!) tests but all BFN..the only symptom I have had is a bit of a sore back and a few wee twinges in my right abdomen, but I know this could be PMS too. Just wondering if its common to get false BFN
when period is so late, or can I be fairly sure that im not pregnant?

Using the morning-after pill may delay your period by up to one week. If you don't get your period within three to four weeks of taking the morning-after pill, take a pregnancy test. Normally, you don't need to contact your health care provider after using the morning-after pill

Hi..thank you, I did read that but just getting myself a bit stressed out I think