My visa cancelled by code 22 cfr 41 122 h 3 can apply ang get new entry visa

This section of law means that the officer revoked your B visa and did so with your permission. An officer may revoke a B visa at the port of entry/airport if he believes that the the purpose for which the visa was issued has ceased to be vald. In your case, you arrived with a USC 3 year old and are preganant with another child. It gives the appearance that you were coming to the US to give birth to another baby in the US so it would be a US citizen. Likely you were asked questions to that effect. At the conclusion of the interview, the officer gave you a typed transcript of your conversation, the questions he asked you and the answers you gave. One of the last questions you were asked was "do you want to withdraw your application for admission to the United Staes?" You responded yes. This is why you were put back on a plane to your home country. Disclaimer: this response does not constitute legal advice or the creation of an attorney-client relationship