Slow growth? or normal?

They may be growing a little slower than usual and it may be because, and a trade off of, planting directly into a larger final container - if that's what you did. My first grow, I grew in a 2 gallon fabric pot; the 2nd, I'm growing in the same setup and same strain but in a 3 gallon I planted directly into after germinating in a paper towel. The second grow did lag the first and I think its because it spent more time laying roots. Its now into day 30 and its definitely going to be bigger than my first plant, despite the slow start, now that its in the pre-flower stretch its exploding in growth. So I think you're fine unless you see some other issue come up.