Could i have an allergic reaction after intercourse if my husband ate pineapple?

Unlikely: Are u allergic to pineapple or related fruits. Most food allergies are due to ingesting them. I think it is highly unlikely that u could develop a reaction to a food item via sexual intercourse, unless you ate some during act. Perhaps u came in contact with pineapple in his mouth while kissing, though I think this unlikely. Unless u are highly allergic to pineapple, I would look for other cause.