Ongoing Nausea and Feeling Off

Hello ladies!

I've been experiencing some terrible nausea for the past few weeks, and it's almost brought me to the point of vomiting (I have vomited a few times. though). My bladder seems almost always full, and I constantly have to use the bathroom. I'm also always tired and I've been feeling... well, off. It's like I know something is going on, I just don't know exactly what it is. I've had sex three times, but I've also gotten my period, so my boyfriend is ruling out pregnancy. I just wanted to ask for you guys' opinions!

Extra notes:

• I'm not on birth control or any meds