Help about pregnancy test

If I'm getting early pregnancy symtomps an my test comes back negative after two an half weeks then why am I having these symtomps. My boyfriend cummed inside me a lot on my period an a while ago. My period was late by 4 days an Ye u started bleed not much but I did an then it kept changing but it didn look like my period blood it was regular an light like it kept changing any ways Ye an ever since he cummed inside me an I have been having these symtomps idk of I'm pregnant or not. Ima take another test next week Thursday I hope it tells me the truth or do I keep on taking it