Late by 5days

Hey guys, I've been trying to convince for about 4 months now. First time since trying my period is late by 5 days. I have been Having cramps, losing my appetite, my stomach hurts when I'm hungry, I'm getting extremely tried lately. I've tested day after I was supposed to get my period but it came back negative, I have a doctors appointment tomorrow. Just need some advice I feel like I'm going crazy 😒🤔