am I pregnant ?

Cassidy
I have a 28 days cycle and usually differ every month by a day or two so I'll O anywhere from 10th- 14th but this month my app said I O'd on the 10th and I was supposed to get my period 3 days ago. I tested 1 day after my period was due with a equate test and got a faint positive. I tested the next day at 2 days late with a first response and it was negative. Tested again today at 3 days late  with a digi & a first response and it's negative. My boobs are definitely sore , I've had frequent headaches and I've have moderate cramps here and there for like a week on and off through the days low more on the left side .. so I've really confused. That first pos. Got me and my mans hopes up.  You think it's still possible? Am I pregnant?