Could I be pregnant?

Gals please help me out I have the implant and have for 2 years in June and for the past few weeks I’ve on and off wondered if I’m pregnant. I’ve got near to all the symptoms and the belly. I’m not sure if I’m 6 weeks today or 2 weeks on Saturday as the first time I though I bled too much for it to be spotting and the second time I only bled a wee bit both times it was brown. I have taken tests but nothing is coming up but I feel like they are wrong should I got to my doctor and see or what should I do? Help would very much appreciated thank you!