Gear change problem - 1st and 2nd

While driving today, I was slowing down and was in 3rd. I went to put the car into 2nd and the gearbox would not go into second gear, it just wouldnt move and go in. When loosing all my speed I tried to put it in first, hiwever this did not go into gear either. Reverse, 3rd, 4th and 5th was able to be selected, so I reversed the car to a safe position. Howevever 1st and 2nd gear coudl not be selected, it just wouldnt physically go in. After getting fed up and waiting around 10 mins, the car finally went into first gear. Upon driving home it happened again. I have only been driving a few months, but I know it wasnt me making a mistake.

It just appears odd it is now working okay, but for some time 1st and 2nd gear could not be selected.

If you have any suggestions before I get it looked it I would be much grateful, thanks.