Oh Antheia... if only we were all so lucky Im sure it is not a problem, bubs is taking a lot from you at this stage of the pregnancy and as long as your belly (and bub ) is still growing and you are feeling well I realy would`nt worry. If you are concerned ask at your next checkup..... They would tell you if they thought there was a problem.
A friend of mine recently had a little boy, when she was pg she was diagnosed with G/D and had to go on a strict diet and she lost a fair amount of weight, I think she nearly went back to her pre pg weight by the end but both her and bub were both fine.

This whole pregnancy experience is amazing but we have so many things to worry about dont we !!! Hang in there.