Pregnancy is possible with only one fallopian tube as long as one or both ovaries are present and the patient still ovulates
Typically, a single egg is released each month by one the ovaries. The egg travels down a fallopian tube, where a sperm may fertilize it. The fertilized egg then continues on to the uterus. You need only one fallopian tube for this to happen.The egg released from the ovary usually enters the fallopian tube adjacent to that ovary. Although evidence suggests that an egg released from one ovary can be transported by the fallopian tube on the opposite side, this is rare. Ovulation tends to alternate ovaries, so it's likely that with only one tube, eggs from the opposite ovary never have a chance to be fertilized.
Also, fertility may be reduced if a fallopian tube was removed due to cysts or infection. In such cases, the remaining tube may not be normal. If you have only one ovary and it's on the opposite side of your only fallopian tube, you're at increased risk of tubal pregnancy
Yes, this is very rare as in most cases the pregnancy is ectopic.
The more likely scenario is that this pregnancy was indeed achieved via IVF.
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