Stress.?

Ok on 07/13 me and my other have laid down and talked about having a kid and we had decided that we wanted one now ..... that was the last day of my ovulation period for this month so I wanted 2 weeks like everyone said to ... I took the tester came back negative but now I’ve missed my period

Is it stress ... am I over thinking ....

I feel different not like a big difference but Iam sleepy more often...

Lmk what you think or what you would do