When and how you found out you were pregnant

Hi As far as I know I’m not pregnant but there are some signs that seem like I might be pregnant I’m scared I’m that I’m just confusing them with symptoms of pregnancy as I’ve tested negative for being pregnant for the last 2 or so months but have only noticed these things in the last month or so I’m a plus size girl I found out I had pcos a few years ago and it never really bothered me now being a plus size girl I have a big stomach anyway but I’ve noticed it’s very firm all over but I’m still getting negative on an at home test (I have noticed other things but 100% can pin it to other things so kinda not worth mentioning) has this happened to anyone else and it turned out you really were pregnant? I have noticed a few other changes in myself that I don’t feel comfortable telling unless it’s like a need to know to be able to answer the question but I’m just curious if this sorta thing has happened to others and it turned out that you were infact pregnant