Help please

So my period is very irregular— for example my cycle has been before 47, 42, 84, 37... etc it changes a lot

So I had unprotected sex and he thinks he could have gotten a little inside me.. but it also said he might not have.

My boyfriend isn’t worried about me being pregnant bc he wants a kid whereas I personally am scared to.

Anyways my period is 6 days late and idk what to think. Could I be pregnant? Should I worry about it? I don’t think I’m able to get a pregnancy test.