I have been having crazy pregnancy symptoms some just creep up and got me hard like nausea and sharp…

I have been having crazy pregnancy symptoms some just creep up and got me hard like nausea and sharp cramping or tender breasts. Now me getting cramps right now is getting me nervous because my period day is around the corner like 2 days away.. How long should I actually wait until I can take a test? I haven't bought any because I get impatient and wanna do it now. Lol, so I told my boyfriend to wait until that day to buy me some then if it comes out positive I'll make an appointment to get a Dr pregnancy test. I'm getting alot early pregnancy symptoms so idk.. This is my third pregnancy so not sure what to expect.