My suggestion would be (considering you have been here for only 2 weeks), spend another month and a half and find out whether you are valuable to them and they

My suggestion would be (considering you have been here for only 2 weeks), spend another month and a half and find out whether you are valuable to them and they are too valuable to you (as an opportunity) then and only then go to them and say that 2 months can be seen as internship period where you were actually being paid less and the relationship seems to be working both ways, hence a more deserving salary will help me keep my heart here for a long time.