Confused and need advice

Liv • 26 years old - Riding instructor :)
Hi, so my period is 3 days late. I have serious nausea, some vomiting, backache, light cramping and sore boobs. Took a pregnancy test this evening but it's negative. Then after the test I had a light pink 'spotting" and when I checked again about 30 minutes later, there was alot less but there was some discharge on the tissue. So confused ><