Irregular, Late & sore

Honey

So 12jan-21jan I had my period then on the 30jan -6feb when can I try testing ... I used an app that has said I'm 30days since last period... I'm a little fustrated because I'm expecting my period due any day and don't want to get excited for nothing . But hopes high I have gotten these weird blue lines over my boobies which I've stopped wearing my bra as it's super uncomfortable 🙃 not sure if it's pms or something else