sick after swollowing cum?

so last night i slept at my boyfriends house. before we spent the day going to food places and coffee shops, but when we got back we were fooling around and i blew him for the first time (ever for both of us actually). he came, but my stomach hurts quite a bit today. is it from the food or is this normal for cum?

update: tried again and didnt get as sick this time. i think i just have to get used to it