Really long but i need reassurance please?

Had sex with my bf March 14. I was ovulating and we used a condom. About 8 dpo I had what I thought was my period but it was really light and only when I wipe sorry if TMI but it lasted 4 days and my period wasn't due for another week. My period is always on time and normal heavy the first day medium the next three and light/ spotting the fifth day. If had a really weak stomach these past few weeks been extremely emotional and tired. Yesterday I had a little blood when I wiped period was due so I put a tampon in and today when I wiped nothing. It's the end of my senior year of high school so I am kinda stressed but idk if it's that or if I'm pregnant? I can't take a test I don't have a way to buy one and my parents can't know. Any advice please help?