Needing advice

Terri • 27 happily Married 💍. Daycare teacher. Canadian Newfie

So I was recently on 100 mg of thyroid medication. I was due to start on December 28 My dosage got increased to 125 the beginning of December. I didn’t start on dec 28. I have no signs or symptoms 4 days late. Every test is negative. Is it possible the dosage increase fooled you my cycle ??