Here’s the negative pregnancy test I got...

I’m 19 and have been TTC for 6months now. I am currently 7days late... I have been cramping here and there and every time I think I’m going to start nothing... The last time I was this late was when I first got off birth control 7months ago but I understand that’s completely normal. I have used this app since I got off my birth control and it has been very accurate on my starting day since. I also once had a “pregnancy”, which I don’t know if everyone would call it that. But I got a positive pregnancy test so I went to the health department to confirm it but it was negative, but I had all the pregnancy symptoms so I made an appointment with an OB. They told me I had a type of pregnancy where I had a fertilized egg but it didn’t attach to my uterus and would pass on with my period. Of course I was confused on how that could happen but me and my very very recent ex started trying again... Could there be some other cause of being late like me and my ex got into a car reck about 3 weeks ago where we flipped the car about 5 times but we did not go to the hospital cause we only felt sore. No cuts or bruises but I have been cramping any time I get up, or when I first wake up, or just anytime I strain myself... could that be reason I haven’t started?? I keep waiting to start my so far NOTHING. I don’t want to tell my ex I’m late and it be nothing. I need some advice. Someone pleeaassseee help!

Update: I woke up this morning with brown discharge... still no period tho. I took a test tonight around 8... go to my page to see it!