I agree, fingering by itself won't impact your fertility or ability to give birth.
I would add, however, the caution not to do fingering unless your hands are extremely clean. Our fingers carry one of the the highest bacteria counts on our body, and the vagina is a closed, moist, warm environment in which bacteria would be happy to grow. So, clean hands and a clean lady-place are very important if you intend to finger yourself. (There is a medical issue called bacterial vaginitis, which can lead to pelvic inflammatory disease. I don't know if bacteria on fingers can give someone BV, but since washing your hands before you touch yourself would be a simple habit to learn, it would be easy enough to prevent that risk.)
No, this should impact nothing. when it's time to get pregnant, fingering will not influence if it happens and has nothing at all to do with fertility. Remember though that your hormones are connected to your libido. And hormones DO affect pregnancy. If you have a regular period, are in good health, you should have normal fertility. It takes the average woman a year to get pregnant, so it's not a fast process for many that are perfectly healthy and fertile. And it won't impact being able to give birth. So, no worries.