Not worth worry
Unless your lymph node is growing in size and it gets bigger than 1-2 cm over the next 1,2 or 3 months, you have no reasons to worry about.
There is no medical condition associated with a "reactive" lymph node. It is a vague and nonspecific term. So I would ignore it unless it changes in size which is not going to happen in 1,2 or 3 weeks time.