You can see whether your ad is under review (and therefore won't be showing) by looking at its status in your Google Ads account.
Every time you submit new ads or make changes to existing ads, they're automatically submitted for review to ensure that they adhere to all of Google's advertising policies. We review ads in the order that they've been uploaded by advertisers. Unfortunately, contacting Google Ads Support will not speed up the review process. Learn more About the ad approval process.