Nervous.. help!!

So I missed last months period and I’m beginning to think I’m missing this months too. According to the app, I’m 41 days late. I took a test about a month ago and got negative results. I have been super stressed out lately so I’m not sure if that has anything to do with it. I don’t wanna keep wasting money on these tests if it could possibly be something else. I’m starting to freak out over this...