I had mirena put in 7 months ago. More times than not I bleed af...

I had mirena put in 7 months ago. More times than not I bleed after sex. Also my period started 3 weeks ago and has not let up except for the last week its been lighter or itll stop for a day then return. Does anyone know if this is dangerous? also i recently had to go and have it checked by my doctor because I could not feel my strings. Turns out they were "sucked up into" my cirvix. I was afraid to ask but does anyone know how it is removed when that happens?