Pregnancy scare

Im on the nexplanon. Ive been on it since April 2018. Everything was fine then i randomly got two periods , Im 36 days late, my boyfriend has noticed some eating changes , Ive been eating a lot more than usual and eating weird combinations of food ive never had before. Like nutella and pickles. I haven’t thrown up or anything just craving a lot of salt. Cramping here and there but no period. We’ve had quite a lot of scares but he is worried about it. It kind of has me thinking as well ? What do you guys think? Are we overreacting?