Symptoms from Trigger shot or pregnancy?

Tara • 32• Married • Almost 3 years TTC • 6 IUIs • Roman James , July 7, 2019 💙 Baby #2 due May 2023 💚 through IVF 💉
I had an <a href="https://glowing.com/glow-fertility-program">IUI</a> done on June 14th...so I'm 6dpiui and I had the trigger shot the morning of. 
I've been having symptoms the past 2 days...my boobs are KILLING me and my back has been hurting. 
I'm still about 10 days away from my period and I've never had boob soreness as a PMS symptom. 
Is there anyway this is from the trigger shot? Or could these be very early pregnancy symptoms! 

Vote below to see results!