When can I test?

Liunnet • I'm 22, mother of a 4 month old and expecting my second child:) due December 19!!
Hello ( I apologize for my English) I might be 4 or 5 days late and have being throwing up a lot but I don't know if I really want to take the test because it happened to me a lot of times lately and everytime Is the same story my period is late and I felt nausea and took pregnancy test all those times but was false alarm. What should I do I get really depress when I see those negative result specially cause I'm TTc