budget-saving homecoming wear that is below 50

Hello
I've been worrying these last couple days because I've been spotting and having cramps on one side of my lower abdomen. Well I had my period this month July 6th and it lasted 5 days. I had unprotected sex July 13th and took an emergency contraceptive 2 days after at 11pm. A week after like July 20th I had faint, light pink spotting. I ignored it thinking it was nothing. On Saturday I had brown discharge and on Sunday as well and today too. It's on and off and my cramps budget-saving homecoming wear that is below 50 ... as well. I don't have anymore discharge now just slight cramps. I'm really worried that I'm pregnant or that it's just plan b side effects. The weird thing is I've tooken these pill and I've never had discharge ever. Soni don't know what to believe. I've read numerous articles and I'm pretty anxious and nervous. Please can anyone help me and let me know if this has happened to them.
Thanks

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