could I be preg???

K so background info. I'm 28 mum of 3 and I have poly cystic ovarian syndrome and I was told I have a 50/50 chance of ever having babies again after my eldest daughter, my partner and I were lucky enough to have a baby in 2015 she is our somewhat miracle baby as I was told I may never conceive again. Now my lmp was in dec around the 18th according to this app that made me really fertile around New Years, me and my partner did the deed New Year's eve and ( tmi bit ) he didn't leave as much mess on the bed as usual, now I'm 14 days late, and I took a test on the 24th of Jan that came back neg. should I wait a few more days??? It's Not stressing me out so I know stress for that wouldn't be messin my monthlys up lol, if it happens it happens.