Frustrated again ( VENTING)

I'm back to being unsure yet again. Damn it. I know, I know Ishould go to a doctor. I will when I can line up a ride. andy who.... I was looking on the site I use. mymonthlycycles.com and it thru me off again. I thought I had it all figured out. Since my cycles are normally 26 days apart I'm to O at 13 days after. Well looking at it, it started the counting on the day of my cycle begins. So if I started on the 18th of Sept. then thats day 1 and right now I'm on day 24. I have been counting wrong. I thought it started the day after, so on the 19th of Sept. would be day 1 and today would be day 23. So I know I missed this months all together. We only BD on the 30th which by that site was the 13th day and O day. I know it only takes once. Any ways, I was told to BD 2 days before , the day of , and 2 days after. I'm thinking the 1st was my O and we bc 3 days before, which actually from online was my O.
I took a test yesturday evening and it was from the dollar tree and it was a BFN. I know some of you get BFP with dollar tree tests, but I never do. A year ago this month I took 2 of them and got BFN and took 3 EPT's from Walmart and got BFP.( resulted in a m/c) I don't have the dough right now to by the 8.00 tests. I wish I did. I'm just frustrated with myself right now. I feel like a complete idiot. Though my AF is due tomorrow or Monday at the latest, I feel like I will get AF, and I am actually not PG. I hate wanting a baby so damn badly , and every month get a BFN. I still feel as if me having a d & c in Jan. was a mistake, b/c I can't seem to get PG since then. IDK. I hope I can line up a babysitter and a ride by my birthday next month.
SORRY NEEDED TO RANT!

Hey Im new to the site. what does BFN stand for? thanks

It may be too early for a Dollar tree test to give you a positive. If my memory serves me correctly, they don't test positive til the HCG level is around 50 uL. First response tests positive around 15 or 25. You might just want to wait a few more days and try again.

Quoting Babymama18!:“ Hey Im new to the site. what does BFN stand for? thanks”

BFN -big fat negative

Quoting Mommy Jrschka:“ It may be too early for a Dollar tree test to give you a positive. If my memory serves me correctly, ... [snip!] ... is around 50 uL. First response tests positive around 15 or 25. You might just want to wait a few more days and try again.”

That could be very well true. I was thinking since tomorrow is AF due date , but Monday at the latest. That yesturday it would show up. I have taken the dollar trere test a week after a missed AF and it still comes up neg. so they sure take a long time to register