PMS no period please help!

Melanie
So this is the third time I've posted this but I still need answers sorry! I've been experiencing PMS symptoms for almost a week and my period was supposed to come yesterday but it hasn't. My period has been getting later and later but my calendar says it was supposed to start yesterday. I haven't had sex but I have had anal. Anybody have any ideas? I'm a little nervous. I looked up what is happening online and it says this is the first sign of pregnancy! But I haven't gotten and cum in me so I'm not sure. Please help! Thanks!y!