i had sex for the first time a day after my period wit a con

if you had sex using a condom and the condom didn't tear or break or come off inside of you , you will be fine.. condoms are a form of birthcontrol though they aren't 100% effective they do work if used properly.. if your stressed because of this and your period hasn't came yet... its probably the stress your putting on yourself worrying about the possibility of being pregnant that's causing your period to be late.. and if your that worried.. you can always take a Home Pregnancy Test again :-) ! but relax its probably just the stress!