Hello Most likely you were given tablet clomid. Clomid is a synthetic chemical whose chemical name is Clomiphene citrate. It is not a fertility drug per se, but it is given only to induce ovulation by fooling your body into believing that there is less estrogen. This leads to an increased production of a hormone called GnRH, causing the pituitary to pump out more of another hormone called FSH and LH, thus inducing ovulation. Clomid is usually given for 5 days, starting on cycle days 3-5, and most women will usually ovulate 5-9 days after the last dose of Clomid. Tvs is transvaginal sonography of Follicular dynamics. The  first thing the doctor will see is the number of follicles that are developing. In a typical cycle, without the aid of infertility medications, one follicle ripens and one egg is released. With infertility medications, particularly injections, more follicles will develop. Near the beginning of the cycle, this information will be used to make adjustments in the dosage of your medications. If the follicles aren t developing enough, the dosage may be increased. If there are too many follicles, the doctor may reduce your medications. In some cases, particularly with IUI, the doctor may cancel a cycle with too many follicles, due to the increased risk of a higher order multiple pregnancy. The size of the follicles will also be examined. This gives insight into how many follicles are developing into mature eggs. In addition, this information will be used to schedule egg retrieval procedures or to administer the HCg injection to stimulate the ovaries to release the eggs. If you are doing IUI, your procedure will be scheduled according to the development of the follicles. Please abide by the instructions of your doctor as she knows what is best for you and don t hesitate in asking her any query. Thanks