My partner and I just started trying to convince the first day we had sex it was 1 or 2 days after my period that was a week ago and now I’m getting a cold last night I had sinus pressure and a headache all night which iv heard be a early sign of pregnancy it’s not that bad now but I have been sneezing even before my cold started and I felt dizzy yesterday almost like my sugar level was low iv also been very tired and just want to lay in bed but the moment I do I can’t sleep I just stay laying in bed awake... is it possible to get pregnant on the first try or is it all in my head?