pls help!! is there chance I could be pregnant??

I'm Late by 6 days. The last time I had sex was a month ago and we used a condom and it didn't break and it was right after my period ended. And then the first day Of ovulation he went down on me but like that's it. I've heard that lots of things could affect your period, and like loads of things have been happening. I just started Uni, me and my bad went on a break, which made me really sad, and I cried for a week... Idk I know there's literally no chance of me being pregnant but in still really worried :( Also, my diet hasn't been that great either... There was literally a week where I'd go like 12 hours without food bc I didn't have any time, so maybe that affected it too?