While it can happen ocassionally, you still need to rule out causes of abnormally high levels of prolactin in nonpregnant and nonlactatating women.
Typically the increase in рrоlасtin in response to ѕսсkliոg in the brеаѕtfeeԁing woman is usually less than 10 ng/mL about six month after delivery, which is one order of magnitude less than the baseline in the immediate postpartum woman which can reach 600-700 ng/mL.
In nonlactating people, nipple stimulation or breast examination does not increase рrοlасtin secretion, at least not to a significant level, but it can increase if you use estradiol based birth control pills.
So if there are any females reading this, if you're lactating when you touch your nipples and you're not using menhera pills, go talk to your doctor and get a thyroid test, prolactin test and brain imaging.
But what do I know, I'm just a little internet guy.