Chemical pregnancy or implantation bleeding?

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Can anyone help??
I'm new to all of this...so Tuesday afternoon (10dpo)after having a few pms/pregnancy symptoms (really sore boobs, cramping, backache and sore gums-which made me wonder if it was pregnancy) I took a cheap strip test and got a very faint line so I took a first response test first thing Wednesday morning (11dpo)and got a positive. Last night (13 dpo) i had a bad feeling and felt paranoid so caved and retested with a cheap strip just before bed which thankfully was still positive. I then woke up this morning and each time I have been to the toilet today there has been a faint brown each time I have wiped (sorry tmi!) It's not heavy and like my period as it is just when I'm going toilet so I tried to wait as long as I could and retested at 12pm (14po) and the positive line appeared quickly and before the control line too which reassured me. This will be our first baby with ttc 10 months, I'm just super worried that this is the start of a chemical pregnancy loss/period, my period is due tomorrow and was going to take a clear blue digital to confirm but now not sure, is this normal?could this be implantation or loss?? Feeling a bit lost with it being our first Has anyone got any advice or had similar??
TIA

I am 4 weeks and 2 days pregnant. On Tuesday 26th April I had negative urine pregnancy test (done at A&E where I had CT scan ) but at night I started having cramps and also brown discharge after I wiped so I wore a pad sure that my period will arrive at night (my cycles are 26 days long). In the morning after waking up I had a lot of thick brown discharge .I ve done pregnancy test which was positive (although not very thick line ). The discharge have now stopped so I guess it was implantation bleeding .

I had a positive test on Tuesday. Now all my symptoms have fade off so waiting to test tomorrow to see if my line also drops.

I'm now 5 weeks and 4 days and found out at 3 weeks I've found symptoms to come and go and I've not had any bleeding since I originally posted.This week I've felt dizzy and nausea to come and go but last week I didn't feel pregnant at all with barely any symptoms and was getting worried but all the tests are getting stronger so it gave me hope. From what I've read on here that alot of people's symptoms come and go especially so early on but most find symptoms hit at 6-8 weeks but then again some have very little symptoms all the way through so try not to worry although I know it's so much easier said than done!