Yellow CM? What does this mean?

It’s not an STD. My husband and I are very clingy and have never slept outside our marriage. We’ve been together for 1 year and the longest we’ve been apart is 4 days and he’ll call me on FT the moment he leaves the house. We’re TTC and I’ve been having a lot of cramps and gassiness. Period isn’t due until March 6 and it’s been over 30 hours since we BD. WHAT CAN THIS BE? And there’s no odor

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