Late ovulation... unpredictable due date

ms. flowers

So I missed my period but didn't get a positive until 2 weeks later. My HCG was literally 0. After i got my bfp I went back and got my blood drawn. My hormone level was that of someone who is 3 to 4weeks pregnant, but according to my missed period I'm supposed to be 7 weeks. Has anyone heard of this?

I know i used poor grammer and punctuation kinda being lazy lol.