Uhhh...help?

So quick history..I’ve always been sensitive to hormones. I had the nexplanon for about a year (had bleeding issues for the first 6 months, stopped, then resumed heavily for three weeks). So I had it removed on December 21. I started on the pill on December 30. We had unprotected sex a few times. A few days ago my breasts start to hurt really bad and they swelled up. And I’ve been nauseous and even woke me up because I thought I was going to throw up. I know my chances of being pregnant are decent but my question is when should I test? Or is what I’m feeling my body adjusting to the new hormones from the birth control pill? Just been racking my brain and guessing at everything 😑 need advice and clear eyes! TIA♥️♥️