Hi There,
the normal gyn cycle is a 28 days interval during which one egg cell matures surrounded by a fluid filled space called a follicular cyst (cyst is just a descriptive word meaning fluid surrounded by a skin). At mid cycle, the egg is pushed out of the ovary (ovulation), then a maturation of the follicle cyst occurs to produce the female hormone, progesterone.
your ovary has a follicle cyst that is resolving. that is a normal process that occurs every month.
Meanwhile, inside the uterus, the lining is getting thicker as the hormones that the follicular cyst is producing (estrogen) cause the endometrial lining to grow. This is all to prepare for a pregnancy. Right before menstruation, the lining is quite thick indeed.
then when a pregnancy does not occur, the lining sloughs. that is called menstruation.
so for you, if your are right before menstruation, that ultrasound could be completely normal.
Now sometimes,for many reasons (stress, hormone imbalances, weight change, final exams, etc), women have a month where they do not ovulate. If you do not ovulate, you do not produce progesterone. You just keep producing estrogen. this can make the lining extra thick and you may have abnormal spotting.
the treatment is progesterone or going on the pill
hang in there. this sounds like are are doing normal things
best wishes
just updating on all new letters. Have you gotten an appt for a gyne yet?