Brought a test today should I take it ?

Lucy
Really hoping to get pregnant I had sex on the 11th , 17th , 18th , & 21th of this month , my period started in the 1st and ened on the 6th .  Is there a chance ? 
Could it be to early to test or have symtops ? 
I was going to wait till the 1st week of October to test ?? 
Lately I've been feeling very very tired , been having nausea and having bad head aches and constipation and for some sort of reason my body and stomach feel a little different .. My period are very irregular so I tired really hard this time to try to conceive since I don't get my periods every month .. My periods usually last up to 3 to 5 days ... So it's hard to track if I'm late because my period are irregular can anyone help me please !!!!