There are two important terms that you should be familiar with. Gestational age is the period from either the start of the last menstrual period or from 14 days prior to conception. Conceptional age or fertilization age is the true age of the embryo because it is the period from the actual conception. In most countries these two terms are separate, although in certain countries they are equal.
Usually the doctors tell the actual fertilization age during an ultrasound scan. If this is the case with you, too, than it is highly unlikely that your ex-boyfriend is the father of your baby.
Given the fact that no data was provided about where you are from, you might want to ask your gynecologist what exactly he meant by 8 weeks. In the end, please note that the age is derived from the dimensions of the baby and differnt babies grow faster or slower than others (although not extremely different).
It is just a statistic expectation of embryos with a certain age to have the dimensions that were found. Perhaps, it would be more correct to say that the dimensions of the baby are similar to those of a baby of a certain age, instead that the baby is of certain age.
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