Weird cycle?

Court

Okay so I need a little advice. I've had regular cycles since I turned 14, but every time my husband and I try for baby my period goes completely out of wack. I won't even be stressing over having a baby, but I won't get my period for up to two months and when I'm late I test, but always get negative results. Last period started on the 18th of august and I ovulated on the 9th of this month. Would you say a long cycle or stress?