What could possibly be going on?

Yes I am very aware that you all ARE NOT doctors but since a lot of you have been pregnant before and may have experienced something familiar I will like to ask just for advice or help.
My period was 3 days late according to the app, I got my period yesterday it was just as normal. A couple days before I been having symptoms of pregnancy (I know that doesn’t mean anything) but it’s now the second day and it’s heavy it’s usually never like that at all it’s usually light but it heavy with clots. During sex when my partner sucks on my breast it irritates the mess outta me to the point where I wanna hit him lol. The cramps aren’t really painful they never are.