16dpo and got my bfp!!!!

I used the glow app as a way to track my ovulation, I was starting here before moving on to temping and opk tests... I have been having period like cramps for the last few days and thought af might show any day. I am 3 days late and had one test left ive been saving. Originally i have been waiting it out to get af and couldnt bear another bfn test, but i caved and took it.. BFP!! The thing that was making me question it were the sharp pains i was having during this time as well as frequent bms and no appetite. Also night sweats..