Entry into Canada

The Canadian government's current page on the matter is somewhat sloppy. Among other things, it merely says that you "must carry acceptable identification." Nowhere does it say explicitly what documents are required or acceptable, however. It says "Visit the Immigration, Refugees and Citizenship Canada website to learn more about what travel documents are required." The link in that sentence points to the "find out if you need a visa" page, however, which only informs a US citizen that a visa is not necessary.

An "archived" page is much more explicit, but may no longer reflect current government policy. It says

If you are a United States citizen (U.S.), you do not need a passport to enter Canada; however, you should carry proof of your citizenship such as a birth certificate, a certificate of citizenship or naturalization or a Certificate of Indian Status, as well as a photo ID.

You should be prepared for the possibility that the Canada Border Services Agency won't let you in, but as far as I'm aware you should be okay with any proof of identity and US citizenship.

Entry into the United States

The Western Hemisphere Travel Initiative (WHTI) specifies that US citizens must use certain documents when entering the US. For land border crossings, the list includes enhanced driver's licenses.

However, this requirement conflicts with the fundamental right that US citizens have to enter the United States. Because of that right, any US citizen who turns up at the border with any evidence of identity and citizenship must be admitted. Even if CBP finds that the evidence offered fails to prove citizenship, a person claiming US citizenship has a right to a hearing before an immigration judge.

Because of the WHTI, however, a person showing up with inadequate documentation will likely have to spend some time in secondary inspection as the claim to US citizenship is investigated. Such a person will probably also receive a lecture about the necessity of having WHTI-compliant documents. In your case, however, you're obviously trying to get one, so the lecture would likely be kept to a minimum.

Assuming the "documents you presented to get the license" include your birth certificate or other proof of citizenship, you should be fine.