Implantation bleeding?

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Edit 4/12/22 : honest test negative so another failed cycle

Had Frozen transfer on Monday - so this is day 4 post transfer

Could this be implantation bleeding? I’ve been quite tight over my entire stomach today and feeling on verge of exhaustion - this tightening has come in waves - and when it does the feeling of exhaustion came with it - as I write this I feel it starting again. Just so uncomfortable

No other symptoms