Could i be

Hi

I have a quick question

My period is never regular I had sex last month on the 18th and didn't get my period the following week and next week according to the chart my period is supposed to start again but I havent been getting my usual I'm about to start my period symptoms instead

I have noticed all I want to eat is anything sweet I have to pee more frequent then I normally do when I lay on my stomach or wear tight pants around the waist it hurts should I worry about there is a chance I'm pregnant and when should I do a pregnancy test