Im really scared please help me!?

my parents wher eint eh ktichen clothed and humping eachother ti was gross i walked ina dn my dad said i was jsut popping her back im grossed otu like almost everyday they have sex and im scared she mgiht have another baby and they where doing sex btu clothed in the kitchen im scared it ameks me angry and i dotn know why i feel like crying!im tihnking abotu telling my mom i kno what humping and sex is i ahve heard details afetr ym dad told me a car and garage joeka nd told me they wher enecad and privates where involved please help me!