Am I pregnant?!

Sooooo before I left to come home from college. My boyfriend and I had some bomb asf "I'm gonna miss you sex" shortly after my period came and ended on the 3rd of last month. It is now time for my period to come. I am feeling all of the symptoms like the cramps, mood swings, weird eating. However no bleeding 😰. I am now four days late according to my app... can I be pregnant even though I haven't had sex in over a month 🤔 ?  Can I be pregnant if I had my period the last month but not this one?