Advice?!

Katie • 20 years young, first time mom to my beautiful daughter🤱🏻 Healthcare assistant 💁🏻‍♀️ Type 1 Diabetic 🧚🏼‍♀️
My period is 5 days late, though I have regular periods. I took a test on Wednesday night and another on Thursday morning however they came back negative.
​Any ideas or advice?