Missed period.

I missed my period by 2 days and here's the quick story behind it. 4 days ago me and so had unprotected sex for like a good minutes then we put in the condom.. (It was 2 days before my period)& I missed it on the 20th.. Here and there I been having little slight cramps and it'll go away but atm I feel bloated and fatigue.. Like wanting to like but I can't.. And tired too! I slept a lot today and I'm so worried.. I tested already and said negative.

I tried to induce my period for days by taking vit c pills but nada... What are those symptoms indicate?? I'm so worried please help me thank You...