on cd 27

Pb

So I think I am on irregular period because my cycle ranges from 35 to 53 days. So my Last cycle from April to June was 52 days. Lately, I've been feeling nauseous and always vomit before I sleep but I doubt this is pregnancy because me and my partner did it last May and had my period on June. I am now on cd27, anyone here knows someone had period but pregnant? Or I am just overthinking?