should I test?

Okay so my periods are usually 7 heavy days. in April my period only lasted 2.5 days and was lighter in colour. went on TTC then in may I started feeling nasous and even vomited a few times. my period then again came on time but also just lasted 2.5 days and was lighter in colour. I haven't tested cause even though it's weird it stil seems like AF. i stil get nauseous at times but don't have any other real symptoms. has anyone experienced this? should I test? could I be pregnant? or should I just wait till the 30th and see if AF comes?