Hello! This is my first orchid and I'm really trying to keep it alive. It was delivered to me as a gift back in March and it is now end of May. The flowers have been in bloom since it arrived. This month they have started to fall one by one.. it almost looks like the flower is closing before it falls completely off. They have developed these dark spots on the back of the blooms, and the leaves have also taken on this darker color. After watering, the leaves perk right up but they still remain darker. There has even been a new leaf growth which you can see in the picture. Any thoughts on what my plant may need? I water once a week or when soil is dry (I have not repotted since receiving) and I ensure to keep her in a very sunny corner of my living room. Any suggestions are appreciated!