WHEN SHOULD I TAKE A TEST AND COULD I BE PREGNANT?!

I'm 18 and my last period was July 24 through 27th.

My boyfriend and I had unprotected sex (no comdom but on the pill) August 3,7,&14.

He broke up with me 4 days ago.

I take the pill at the same time everyday. And he didn't ejaculate in me. Just precum.

I've been extremely nauseous lately. In fact I stayed up all night last night and finally got to sleep at 7 pm because it was that bad. I was sleeping with my waste basket on the bed by me. I can't seem to eat anything. The thought of food just makes me gag. I do want pickles though. I don't know why I want pickles. Or maybe a bite of pizza.

I have two pregnancy tests.

Should I even take them or no?

If so, why do you think so, like is there a chance I could be...?

And if so, when should I?