I dont know

I dont know when i ovulated i could be 8-9dpo or 5dpo tmi i had sex on period with my boyfriend sept 7-8 had some brown and ewcm day after 9th now. I have irregular cycles 24days cycle that i have really notice and i do know it some times short cycles u can ovulate early so im lost i have been googling about alot of things and getting mixed info from alot of different sites some say u can ovulate early and some say u dont some say its not possible to get pregnant on your period some say u can... i have been montior my cp and cm but not sure what i am looking at or for i been doing a little research on possible dpos if i did ovulate on cycle day 10 i would be right now 9dpo which i have been getting some symptoms from 5-9dpo i been cramping a bit low pressure down below a bit nausea here and there mostly in the am or mid mornings I dont have to go to the bathroom as much or dont have sore boobs maybe a couple of twinges or burning sensation here and there in the boobs around 6dpo i woke up with a sore throat now im possible 8-9dpo and i have a full blown headcold i felt a wave of nausea this morning i did take a pregrancy test it was negative... and if i ovulate on sept 14 like another app said i did then i would be 5dpo today so i am really confused anyone please help