could it be??

I'm a 17( turning 18 on the 23rd of November ) year old girl. Three days ago af was supposed to arrive but never showed up... and on the 19th of October I did babydance with ex boyfriend during ovulation cycle.. so far I took a test on the 30th which was before 2ww and it came up negative. now it's been 2w and 5 days since baby dancing.. a few days ago I broke down crying cause my dog played with me and he rarely does anymore. I've been nauseous in the late afternoons almost daily. I usually smoke, but recently the smell of it makes me Gag. what do I do, should I test again