nausea

Did anyone have extream nausea/vomiting before labor? If you did how long did it last before you went into labor? I've been having quite a bit of sings labor is right around the corner. And I am due in 3 1/2 weeks. And on Tuesday I was dilated 2cm. Which I know isn't unusual and you can be dilated at that for a while. I just have a feeling I'm not going to make to 40 weeks. And I ask about the nausea because I read that's a sign, and I've been feeling nauseous everyday for the past week but today it's worse like I'm about to throw up. I know everyone is different, and these signs can last for some time. Just seeing if anyone experience anything similar.