did anybody have a feeling of "just knowing" they were pregnant after conception?

Hubby and I BD on almost all of my fertile days, today I woke up with a weird feeling overall. my mind keeps going to the same thought "I'm pregnant". I also feel a dull lower back ache sort of like pressure and I've been getting these weird cramping/boating feeling in my pelvic area. I also had a very realistic dream last night that I was at the doctors and the doctor was pressing down on my pelvic area and she would happily say "yep! Your pregnant" haha I don't know if maybe it's just my mind playing games is if it's waaay to soon to "know" 🙈