Help please !

Ely • Mommy to a 9 year old Prince &' expecting my princess March 2016 💕💙
How soon can you take a pregnancy test? I have been urinating frequently as of Friday & have been extremely hungry. I ate a lot last night pretty late too & I woke up this morning starving lol. I feel full but I'm hungry. I did the BD twice when my ovulation was at a high percentage. AF starts around the 31st. 
Could I be pregnant or am I just over thinking?