Two guys one egg 🤔

OK so I had sex with one guy the 26. Three days later I got my period. 10 days after that I ended up having sex with my ex. Then after that I got my period again(both regular btw). Two days ago I found out I was pregnant. I'm not sure who the father could be. Can u give me some advice about ovulation. Please no negativity lot judgement I just need help!