basically as the ovarian reserve (number of eggs remaining) diminish it takes higher levels of FSH (follicle stimulating hormone) to get an egg to grow and hopefully ovulate.
the higher the number on day 3 the worse outlook on ovulating..thus, pregnancy.
5.5 is fine.
you might also ask your doctor about a test called AMH (antimullarian hormone), which is even better than the FSH at checking ovarian reserve.
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