Anyone had strong pregnancy symptoms but end up not pregnant or miscarriage?

Anyone experienced like me? i had strongs ones like intense nausea (morning and evening sickness), implantation bleeding (only one day of brown stain) and super sore breasts, late period for 11 days and my 2 pregnancy tests were faint when i tested early. And then, period came. I was like whaaat? All that and not pregnant? 🤨🤔 I have 2 kids and was pretty sure that i was pregnant.