CD 33 no period?

Recently took out my nexplanon to ttc in November. On Christmas eve I got my period ☹️☹️ than we baby danced only one day during my fertile week maybe even before the window started. I downloaded a couple apps to see how my period would be since I’m ttc, but they all say my period will start on different days. Even my fertile days are different. Idk how my period is since it was my first one back. Always been 5 days on my period, 28 cycle days. If so I’m 4 days late. I wanna think I might be pregnant but probably my period isn’t back to normal 😫😫