Feeling overwhelmed with TTC

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I've been TTC for me third since August... I'm starting to feel really defeated! My cycle was on track every month until we decide to start trying now it's irregular and AF just keeps coming when I think I'm "late" and crushing all my hope... Starting to feel like I don't even want to do this anymore... It's adding stress to our relationship and my emotions have been nuts lately... I just want a daughter but it's not worth the emotional rollercoster I'm on 😕😭