Hi, I'm 5'4, 56kg. Recently, I knew that I have GERD (gastro-eosophangeal reflux disease) *I don't know if that helps to my question but I had sex yesterday (wed), today is (thurs) morning. We used condoms, but I can remember that he might have touched his 1st condom and then touched the outside of the 2nd one and as a pre-med student I know that, that might not be good. I had my 1st day period last Nov 23 and I had sex Dec 2. Is there a possibility of implantation? And can daily hour exercise prevent me from being conceived? I have a very irregular mens. and I really wanna know if I'm gonna be safe or not. Thank you