Pls help me my body is being super weird lately

Is this a sign of pregnancy? Heyyyyy girls I need u guys opinion. So last time I had sex was November and after that time I was sooo scared I was pregnant that I told my parents we [me and my mom] took a pregnancy test and it came up negative. Since then my periods have been irregular ( instead of lasting 7 days it lasts 9 and the break between them used to be 30 days now it’s 21). I have gotten my period 3 times after I’ve had sex the last time. But I always feel hungry and my stomach is always growling!!!!! I’m kinda stressed. Is there a chance I’m pregnant and is my period normal?