With ds I just knew I was pregnant (I was 18) I did 4 pregnancy tests all coming back negative (after period was due) but I knew I was, about a week later I finally got a faint bfp, so I was right.
With dd (20 years old) I again just knew I was pregnant and I wasn't trying (due to get married in a short few months) but I had this intense feeling and yep pregnant.
With this bub again I just knew. Infact dd was having an operation so I wasn't worried about doing a test till we arrived home but I messaged dh and said I am pregnant but haven't confirmed with a test. Low and behold I did a test 2 weeks later and yep pregnant.
I have always just known. I haven't needed a test to tell me I am. Amazingly my mind just tells me