Am I okay..??

Had sex day after period it was protected. The thing is I’m not sure if he came in me with it on. Well my boyfriend said he didn’t cum inside me and I kept asking him to make sure and he kept saying he didn’t but took make sure none of it got in me just in case he accidentally did. I put water in the condom to check and see if there were any holes or tears, and there were none. Im in fertile stage, and I feel sick to stomach and feel dizzy, slight cramps, very clear stretchy discharge ...I just had sex last week and ikno pregnancy symptom might not show up that fast . Should I be okay?