Can i be pregnant?

So. I am on the minipill but the week of Easter I started taking antibiotics for a gum infection. I learned later after I finished them they could cause my minipill to not work. According to this app my highest risk of pregnancy would be the 13th of this month so that would put me at 8 DPO. For past 2 days I have had continuous heartburn and sore boob's and every now and then I get a weird taste in my mouth. According to Glow my next period is due in 7 days. Can i be pregnant or is this just part of PMS? I literally never get heartburn and I can't get it to go away now even after taking tums.

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