If you haven't had sex since before your last period, you're most likely not pregnant. If you had a regular, on time period after your last time having sex (with a condom) then it's very unlikely. If you've just changed to a gluten free diet, that can change your period, any differences in diet, exercise, stress, can delay your period, and you have to do the "full deal" to get pregnant. I wouldn't worry about it!, If you're still not getting a period within the next couple of weeks though I'd make an appointment to see your OB/GYN just incase there's an infection, or anything like that, good luck!
Thank you. He and I really are not "scared", but as more time passes the more we a psycing each other out with random things that only have a one in a million chance of happening. Like him having a little on his hand and such like that. We try to make a joke out of it, but its like the longer it goes the more we get worried. I have plans to go in the future. Thank you again for your help.