I'm almost two weeks late on my periods (not had a period in two months). I've been sexually active on the following days : 29/11/2020; 12/12/2020; 20/12/2020; 27/12/2020; 03/01/2021. I've used protection everytime. I took upts on 22/12/2020; 29/12/2020 and 03/01/2021 All were negative. Took them first pee in the morning. What are the chances on pregnancy. I'm extremely stressed out I've also gained weight. And have a terrible sleep schedule. What could be the reasons for my periods to be missed/delayed?