My iud

Ive had mines in for going on 2 years in December after i had my son who will be 2 in October. Ive had the irritating periods that came along with the painful cramps heavy blood flow and fatigue mood swings towards my man. But this is something new ive never been late or missed a period until now im 4 days late (not so worried bout being pregnant at the moment i have 3 kids so i will know the difference) but feeling nauseated and i dont feel like my period is going to start normally id be scarfing chocolate down my throat and thats the only time i eat that but im not even in the mood for it. Any advise will help please and thank you.❓making a dr app soon as possible. They have an opening on Monday but my son needs to be seen same day for an asthma attack he had so i cant be seen till Thursday but i wont go if it starts...