How long does it take to see changes?
An untrained person will make a great deal of progress in the amount of weight that they can lift initially, but little of that is due to an increase in muscle strength, per se. During this period, the body learns how to recruit muscle units during exercise effectively. Once they become effective at recruiting muscle units - and this usually takes place in 4 to 8 weeks - then muscles can be overloaded during exercise, and stimulated into hypertrophy.
If you've been working out for a month and a half, you should be almost finished with the break-in period. In the next couple of months, you should notice muscle gains.