4 weeks 4 days pregnant and spotting


I am 4 weeks, 4 days pregnant (it was unexpected as we were about to start <a href="https://glowing.com/glow-fertility-program">IVF</a>). Starting on Tuesday I had spotting that was light pink. Yesterday it was mostly light brown and now this morning it’s dark pink. The cramping was only on Tuesday. My hcg has risen from 141-313 (Monday-Wednesday). I am A- bloodtype. This is my first pregnancy. I am 40 years old. This spotting makes me so nervous!! Has anyone experienced this?