Anyone found out they’re pregnant after having a period?!

Li

Sounds crazy but I’ve heard of women finding out they’re 4+ weeks pregnant even though they had their period like normal....I had mine couple of weeks ago but since before AF arrived my boobs have been swollen and slightly tender. Normal for me but always goes away soon as AF arrives.....seems strange and I’m gna do another pregnancy test ASAP but wanted to hear anyone else’s experiences like these :)