prego? help

Sierra

my first day of my last period was Feb 22 and they last 4 days. I ended my birth control that sat so Sunday the 4th was my 1 day off BC. what is my fertal window?? He finished in me 2 (i think the days were the 29th and then the 5th) ive had pains for 3 days in my lower adomal area on my right side. I thought it might be because I'm dehydrated but I've drank like a whole river lol what are the chances of me being prego??

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