late period blues 😰

My period is 4 days late... I'm not a virgin, however I'm not quick to say "I'm pregnant" as, because of medication, my partner can rarely reach his climax. I'm stressed at the moment so that could put a damper on it as well. And I also have realized that I lost a lot of pounds.. probably due to the stress. Being a relatively skinny person, it's never really bothered me, but when I dropped 7 pounds in the last year I got nervous. I would be greatly appreciated if someone could respond with any help. As right now I feel really terrible 😖😖😖