Missed period & BFN

So I missed my period Monday and am now 3 days late. I don't think I've been late since high school. I took a test and it was negative 😞. I did start a new medication so I thought maybe it could be the reason why I haven't started. I called my doctor and she said it shouldn't effect it. She stated it may be too early still and to try again in a week to see if anything comes up if not to make an appointment and go from there. Just still so frustrating!! Fingers crossed I get a positive soon! 🤞🏼🙏🏼