Serious answers only please

Sunshine☀️☀️ • Married. 24 yr old young woman. SAHM. To my wonderful 3 yr old son. Ttc baby #2
Okay, so I have an irregular period. I am currently on cycle day 42. This is the longest cycle I have had. AF was due on the 16th which was cycle day 38. I have taken 3 pregnancy test. All BFN's. So my question is there any possibility I could still be pregnant? Or does test prove I'm not pregnant? Its killing me to know. Also, has this happened to anyone before and they got their BFP? Just a little later.