Need advice ..

Angelica

So I’ve been seeing this guy and a few times we’ve had unprotected sex..my periods usually arrive on time or earlier & are 7 days long.. but In February I’ve realized I had my one period but then another one a little towards the end of the month but only lasted 4 days started off a little heavy but then the last 3 days it was very light. Now I’m only about 4 days late ?? Took a pregnancy test but it came out negative any opinions on this ???