Light pink period blood

I am on nexplanon and have been for almost a full 6 years I'm 3 months away from it expiring and I usually have my period on time but this time I was 24days late I'm not really bleeding alot but I'm cramping terribly its it normal while on bc to get this I'm a little paranoid because my bc is about to expire and I am a bigger girl around 250 and I know that weight can offset bc lmk if anyone else has a similar issue