test or wait?? advice please!

trina
i am 13dpo. my cylce was supposed to start 4 days ago. yet my cycles are usually irregular but for the last few months they have been the same from start to finish. i dont know if i should test or wait? we have been trying for two and a half yrs to have a kid and we really want one so i dont wanna get my hopes up. should i test or wait? any advice???