Pregnant?

Hello just need some advice my periods are irregular but never longer than 45 days apart ever. a few days ago (cycle day 43) i started getting pains in lower stomach but then only was spotting little bit brown when i wipe and that's how its stayed till today cycle day 46 and today its hardly nothing when i wipe(ive been wearing a liner just incase and I've not even needed too). I also took a test yesterday on a hcg stick and it said negative so dunno what to think?😑😒 Would just love a bfp