Period

I recently had a period on 2nd July but then my period came on July 22nd I harvest always had irregular periods but this has happened only twice now since I first started getting them i have been checked for STIs and it all came back clear however I get very very mild cramping but when my period is about to start I get period like cramps and cry over anything and everything but I've been having angry outburst out of the blue or mood swings I've felt quite sick and also vomited a tiny bit I've been tired all day And had little naps through out I've been eating a lot and starting to feel sick to certain smells I can't get my hands on a pregnancy test yet so I'm just asking for what you guys think I have also tried to book doctor appointments but in my area they are always fully booked please no hate I'm just really concerned aha x