Welcome to the Quilting Board!
No, it is not going to fall apart. There are as many ways to make knots as there are quilters (well not quite). I have made my knots like you do for toomany years to count and nothing has fallen apart.
"Be yourself...everyone else is taken."
Strong people don't put others down...they build them up."
"Remember that your instincts are more important than rules"
No one has ever become poor by giving. - Anne Frank
Darkness cannot drive out darkness; only light can do that. Hate cannot drive out hate; only love can do that. - Martin Luther King, Jr.