Can someone help me determine how many dpo I am?

Last period was 9/25. Cylces are usually 32 or 33 days long. So my next period wont come until about 10/27 or so. Wed BD 10/4 10/6 10/8 and 10/12. I tested today and got a BFN. My got so swollen starting this past Monday. We've been TTC for 7 months. This is the first time my s feel this way. Ive been getting shooting pains in my too. Other symptoms are queasiness, bleeding gums, and dizziness. I'm trying to figure out how many dpo I am. I really feel I'm pregnant this month. I wanna know when I can test