HELLPPPP!!! Please tell me I'm just paranoid!!!

Hey humans I need help, Ive been on the pill for a month, and I take it everyday sure days I miss the exact time but not too bad... 
Any who just under two weeks ago, this guy & I (fwb please don't judge) had sex and since I'm on the pill I thought not having a condom is okay as long as he pulls out... He did not! (Kinda a douche about it actually... Came inside and asked if I was on the pill after 😡😡😡... Not important atm)😔😔😔 
So I was okayish about it as you know pills there for a reason, but that night I came down with a horrid flu so I was taking antibiotics as well... I've heard they don't mix but hoped, now I've been on the sugar pills for five days as it's gotten to when I take them BUT... my period hasn't come, please tell me I'm still paranoid and the period sometimes doesn't come... I'm 18, can't be pregnant especially to one of the biggest fuck boys I know 😭😭😭 

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