Can i be pregnant?

I went on the pill 3 weeks ago almost 4 I have 2 active pills left then I go on my inactive pills on Wednesday. 
​My boyfriend and I have been having unprotected sex he doesnt ejaculate in me. Lately ive been feeling nauseous at night. Is it the pill fucking up my hormones or can I be pregnant?
​Ive never missed my pill. The latest ive been in taking my pill is 1 hr and 30 mins (4pm daily) but nothing beyond that