late periods

so on the 22nd of June I took the morning after pill as a precautionary measure because my boyfriend and I weren't sure if he'd quite pulled out in time. So anyway that meant I had a period on either the 22nd/23rd until about the 27th... and then had another about five days after. My app however says I'm now three days late and I'm wondering if this is simply my cycle readjusting or if I could somehow still have fallen pregnant? I haven't had any accidents since. (apologies for the lack of accuracy I've messed up my tracker so I'm not sure when anything was).