Is something wrong with me?

See last week I was ment to have my period according to my app. I had this small amount of really sticky light brown discharge for two days and then it stopped. (There was no spotting!) My periods have never been like this. I do however have regular cycle lengths. I am hoping that it is just do to stress I have around schoolbut idk. Condoms is my contraseptive. I did have sex the second day and couple other days that same week. I was in a new environment house sitting. I did start college this week and am super stressed like I normally am.