As you mentioned 2 braces are removed , i assume that you got full braces on the top 12 teeth and / or your bottom 12 teeth . If 2 have come out of that no need to worry whenever you visit your orthodontist they will fix it .
I understand that the gap is closed right now but please keep in mind that the gap can reappear as the brackets which were putting a force on your teeth have come out and at present these teeth do not have any force on them .
If the gap reappears brackets can be placed back on it and the force will be reapplied to close it .
Next Steps
Visit your orthodontist , he/she will be do the needful
Health Tips
Braces is a long duration treatment as it is a natural treatment . Be patient the result will be good .