It depends. The "morning glory" seeds I've seen in the commercial packets and whose descriptions I've read are all of the genus Ipomoea (e.g., Ipomoea tricolor, "Morning glory").
However, Convolvulus althaeoides tenuissimus (no common name provided in Sunset's Western Garden Book) earns the comment, "Spreds by rhizomes and can be invasive. Good in rock gardens, hanging baskets." And "tenuissimus" means "the most tenacious." Hmmm...
In the introductory paragraph for Convulvulus spp., Sunset states, "Common vining morning glories (Ipomoea) are sometimes sold as Convovulus."
I would go back and read the descriptions of what you planted (seed envelopes, maybe?). Most likely, if it was from seed, it was the nice, only mildly "vigorous" Ipomoea.
Sunset Zone 17, USDA Zone 9