advise??

Marina
Hey gals so I had sex the other day.. and I'm on birth control (the three year implant one). So I'm not really worried about pregnancy or anything but there is something else...
Later that night I started bleeding as if I was on my period. But it's different because it's a lot heavier than I've ever had and it just isn't the same...consistency. Any ideas on what the heck is going on? I'm terrified of doctors and I'm a little concerned honestly.. also should I bring this up to my fiancé?