Nervous

I had sex on a Sunday and 4 day later I got my period but it was a different period it was lighter and really dark and it was for 9 day so it was longer than usual. I didn’t think much of it but now it’s been a month and my periods late a whole week... I’m nervous because Ive gained a little weight I have small cramps here and there not to bad my boobs are really sore I have to pee a lot more and been really tired and those are a lot of pregnancy symptoms so Im nervous and confused if I might be pregnant or not ??