Hurts to poop today (sorry tmi)

Yesterday I bought some Dark Chocolate almond milk from the store to try, and I really liked it and I've been drinking it. Not excessively but I've had probably 4 or 5 glasses since I bought it. I just went to the bathroom and my poop Is just hard to pass and it hurts. I haven't changed anything in my diet nor am I taking any medications. And it just happened today. Do you think it could be from the almond milk since I'm not used to drinking it?