Gave up.

So me and my SO have been TTC for 3 months and we actually sat down to see if maybe it would be a good idea to just wait. We want to fully enjoy our relationship before getting preggers and it does sound like a good plan, the only problem is AF only lasted 3 days out of the usual 7 and im feeling nauseous almost everytime i eat and am constantly exhausted ( i have a 3 year old from a previous relationship so i know how early signs feel) . I mean its not a huge problem but how come now that we stopped trying I actually might be pregnant?? Has this happened to anyone? I think stress does actually play a huge part in conceiving! Cuz i was stressed every day about not being pregnant