Could I be pregnant? Negative tests but...

Xtina
Hello guys 😘 nice to meet you all! fiancé and I are trying, hoping to have a baby this year/early next year! We are both healthy, I'm in my 20's so really hoping it happens soon! I know it could take a good while... And that young and healthy has nothing to do with it really 😁 I'm just hopeful!Anyway! My period was 6th of Jan, lasted about a week... We tried on the 20th which according to the tracking app called LC was my fertile days.. The 28th I had some bleeding, an exact week before my period was due to come on again, according to the app. I thought this might be implant bleeding, so I tested the 30th, and I also tested on Saturday morning (6th Feb) all tests negative :( the bleeding did go on for quite a few days, but it was really light I didn't need to even use a panty liner, except for 2 days where it was about a teaspoon worth! It varied from brown, to pink to orange to brown.. BUT lasted about a week! My periods are usually very heavy, like 3 full pads a day heavy.. This was not at all normal!Whilst having this bleeding, I've been dizzy, nauseas and headaches ; I've also been so tired! I might just be stressed or overworked?!If my app is right, I'm about 3 days late now. I then downloaded the app GLOW and entered the past 7 months cycles and according to GLOW I'm only due my period in about 4 days! Ahh what app is right! I am irregular sort of; but no matter the app; the 20th does come up as being fertile!So confusing! Hoping I am pregnant but surely the tests would've showed as I'd be about 5 weeks if correct?!