Possible pregnancy or just PCOS

Me and my boyfriend had sex the week of December 14th cause that's when I was most fertile. I had my period normal that month. And I was ovulating on the 19th. 
I'm about 7-9 days late this month with no cramps, or signs of my period coming. I've had a few nauseous bouts but nothing like throwing up, just a sick feeling. A one or two days smells got to me and made me feel off. 
We're TTC, but being as I have PCOS I can't tell if I'm missing my period because of that or because I'm pregnant. I don't know when I should get a test because I'm scared I'm just gonna cry over another negative result.