Long one but bare with me please

Me and my husband has been trying for quiet the time now for our second child, our first I got pregnant on bc😳.The day that it said i ovulated on the app I did a test and had a positive ovulation. We used preseed everytime we were active.My period is never right by the app though, I usually start 3 days before the calendar. So really I would be 3 days late today and I’m just having enough to say it pale pink when I wipe and it’s not everytime I wipe and I’m having zero cramps as before when I’d have my period I’d feel blowed up and cramping like a mother f*cker.. but yet I’m not getting bro. For the last week I’ve been nauseous as f*ck, smell of foods that I love I can’t go near and just random smells that no one else is smelling I am! And I cant get enough sleep.This is driving me insane!!!! I’ve took so many test and been had a couple look like lines but everyone says it’s indents or color run, what’s a girl to do? If I get blood work would they be able to detect it now if it was anything there?