15 Days Late

Hey guys my period is pretty much always on time due to tracking everything in this app for at least 6 years. I am now currently 15 days late and I am worried af. I keep getting very mild cramping and my boobs have grown like crazy and are very sensitive and now they are covered in stretch marks. I haven’t gained any weight recently and I am not stressed. A week before I was supposed to get me AF I was feeling super dizzy and nauseous but it’s gone away for the most part. I took two tests and got negatives. I honestly don’t know what to do at this point. I don’t want to waist money going to a dr if it’s all just gonna be negative.... Also my poor bf is going though with this every step of the way and he’s really worried. I have been on the ring for months so it’s weird. Any help would be appreciated....