need serious advice! (especially if you've had kids/are a nurse or something!)

Wa
Okay- so on this app says that I am 4 weeks and 1 day- but I believe they use your last af date? I have used calculators online to find out how far I am- using the day I conceived (we only went unprotected the once), and it says I'm 6 weeks! Which is more accurate! I feel like six weeks makes sense, because I'm showing a bit more like the posts that are 6/7 weeks- but I know it might just be major bloat! Need ya'lls advice PLEASE!! I'm a new mom and have no idea what I'm doing. 😓 
Plus most people say go to the doctors at six weeks- and idk if I'm there, or still super early!