Sex and love

Hey ladies so my boyfriend let go inside me on the 19th, yes I was anxious so I took a pregnancy test on Friday and Saturday I believe. However now I’m having a pain on my left side and my head hurt. Help me ladies do you think it’s gas and a caffeine headache? Or is it possible that I’m pregnant?

I want a baby and I thought he didn’t but he didn’t change towards me or say take a plan B😊 I’m just hoping b wise I just turned 35 in n the 17th of this month. Any advice would help....