Missing Church

For the last two week, I have been unable to attend Liturgy. I am volunteering to assist my friends with an important project and it has been taking the entirety of my weekends. Because of this, I have not had time in the morning to attend Liturgy.

With that, I still go to 3 weekday Lenten services.

Is this a sin? I’m a Catholic convert so I’m used to it being considered a grave sin.