Irregular periods pregnant or another problem?

I had unprotected sex on the fertile day two months ago.

I had my period the following month but it was extremely heavy.

I skipped the whole month of my cycle.

Now I’m having a very late heavy period.

I have crazy lower back pain nausea and heavy bleeding with egg white discharge mixed in.

any of this possible while pregnant?

Could it be ovarian cyst or endometriosis?

I’m so sick to my stomach help !