Need advice!!

So I slept with a guy two days before New Years <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> and I came on my period around 2 days later but it's now February and I haven't had a period and it says I'm 4 days later?? So am I possibly pregnant? But I did a pregnancy test last week and it said I wasn't but was it too early to say😩 I'm so confused