Spotting

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Hi everyone, first <a href="https://glowing.com/glow-fertility-program">IVF</a> cycle here..

Took my last BC on the 19th and didn't get my period until the morning of the 24th. Started stimulation drugs that evening and have been spotting ever since. Brown, not red and not alot.

I have an US tomorrow morning but I'm nervous that this means my lining is super thin. Anyone have any thoughts?