Food allergy?

Ok weird question but I’m wondering is anyone else has experienced this.

So before I was pregnant & during my whole pregnancy I ate and drank coconut everything lol I loooove coconut! Always have.

Well a couple weeks after having my daughter I had drank some coconut milk in my coffee & I noticed my lip swell up. I didn’t think much of it because I was eating my breakfast with it and thought it was something else.

Fast forward to Christmas eve and my SIL starts making a drink with coconut milk , cream of coconut & Malibu - it was bombbb I drank like a whole glass and noticed my lip swelling again and the back of my tongue and throat itching

Again, I didn’t think much of it because I was snacking on all the other snacks they had out at my mother in laws house. I drank some water and after a half hour it went away. Then I got another glass of the drink and it happened again. So at that point I was like it has to be either the coconut milk or cream of coconut.

So then YESTERDAY, I was making coconut flour pancakes because I’m doing Keto & I forgot about the symptoms I get after having coconut!

I got all the same symptoms again but they went away within an hour

My question is: is it possible to develop an allergy to something after pregnancy?