Sex while on the pill

Beth • Happily living with the love of my life. I`m 20, and Australian. Always happy and delighted to have a conversation :)
I've been on the pill for almost 3 years now, and take it every night without fail at 6:00. 
Would it be possible to get pregnant? And would it be possible while on the pill and having my period??
We aren't TTC, we're just curious...