Hello, I'm wondering do I need to just go buy a pregnancy test. My doctor moved me over to a birth control that's…

Hello, I'm wondering do I need to just go buy a pregnancy test. My doctor moved me over to a birth control that's supposed to "trick my body" into thinking it's pregnant, because of ovarian cyst. Well I have had an increase in smell, like no tomorrow, waking up sick in the middle of the night, with my mouth watering. At times I feel like I'm going to pass out! I feel so droggy, upset tummy . I called and they told me it shouldn't make me have symptoms like that! I've also been spotting for the pass few days. I'm also wondering could it have been something that didn't set right with me, like something I ate.