Help ?

Lucy
I've been trying to conceive for months now . I have really irregular periods , I might get my period one month and not the next or not have my period for 5 months . 
I got my period on the 1st of September and it ended on the 5th of September . 
Me and my spouse had sex on the 11th of September and also are planning to have sex again 2"m . 
It's hard to keep track of my cycles . 
But from what I've heard you can ovuatle before and after your period and up to 10 to 12 days after your period 
I've had sex 3 times since my period left which was on the 5th of September I had sex on the 11th and 14th and planning to have sex again 2"m . He's been finishing inside me for these past two days and I'm hoping I get pregnant , is it possible ? Help anyone ? Need someone who can really sit and help me .