Advice

So i stopped my birth control November 24th because i wanted to test a theory that it was causing my constant yeast infections so of course I spotted November 27th and my best friend came right away November 28-29 cause of stopping the pill. Ovulated the 15 of December but had sex the 12,15,16 and 17. Been having all symptoms of pregnancy since the 22nd of December and had a negative test the 23 but I’m extremely nauseous and can’t even get down with my husband without wanting to throw up on him. And my best friend doesn’t start till the 29th. And my mom swears up and down I’m pregnant by the way i look and gained 10 pounds without eating because i only eat 1-2 meals a day if i remember not because I’m worried about my weight cause I’m not. But just need some advice