I have been haunted by this for years...

When I was 18 me (24 now) and my current fiancé were having unprotected sex, 2 months later poof I took a clear blue digital test and it showed pregnant. My period was 4 days late. Took a first response test showed positive. Well I started cramping severely and bleeding very heavy. I went to planned parenthood bc I was worried I may have had a miscarriage. They asked me for a urine sample. They sat me down and told me I was not pregnant nor could have been bc the hormone would have still been in my urine. Unfortunately being so young and just not knowing I waited a day before going to planned parenthood. It happened to me in the evening hours and I was to afraid to go to my doctors or let my parents know. So I waited until planned parenthood opened. My current fiancé said he knows I had a miscarriage and always acknowledges we lost our first baby. That nurse seemed so confident I wasn't. I always felt I was. I never make it apart of my ob medical history. But I always keep it in my heart. It's just the not really knowing part. My question in your guys opinion do you think I was or wasn't?