Labor symptoms?

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So this is my third baby, but I’m trying for a Vba2c. I never went into labor with my first two so I have no idea what to expect.

If you’ve had a baby previously, what were your first signs of labor?!

I’m 35 weeks 3 days (I know it’s still early to have him) I’ve been having cramps, back pain on and off, acid reflux is back, super nauseous, diarrhea since yesterday (tmi) and I feel like I’m leaking fluid, but I’m not?!

Ugh, pregnancy is hard and knowing what to look for labor wise is even harder.