Late period...ugh

I had my cycle both in February and March but since then nothing and the last time I had sex was in January before I left for cali and I had a normal cycle in February and March but since then nothin. I know I'm stressed out and that can mess it up and I'm not over weight or under weight so I don't know what else cause be messing with my cycle and it act's like it's trying to come off and on but nothing has happened.