Period is 4 days late!!

Hey, everyone. I recently went off sprintec the end of June and my hubby and I started trying earlier this month for a little one. My period is 4 days late and it’s never been this late. I’m not sure if it’s stress or my meds that I take for my UC. I get my infusion tomorrow of Remicade. I took several at home pregnancy tests and they all were negative. 😔. Maybe I was mistaken my UC symptoms for early pregnancy symptoms?? 🤷🏻‍♀️ This will be our first baby and I’m terrified because of my UC. Anybody else experienced this? Your thoughts and input would be greatly appreciated! ☺️