Brown spotting at 6 Wks

Holly
I am 6 weeks today from <a href="https://glowing.com/glow-fertility-program">IVF</a>.  Today when I inserted my progesterone capsule there was brown mucus-y blood.  I know brown blood is old blood, but still disconcerning.  The REs office said it was ok as long as it was big red and heavy. Anyone else have early spotting?