Pregnant or not

Hi ladies I recently had a miscarriage my bleeding stopped on the 6th sept. We of course are trying for a baby so didn’t waste any time. I have been having the symptoms I had with my miscarriage sore boobs.

I have done pregnancy tests but there is a very faint line but only able to see under the light. Is it too soon to test? How many weeks would I even be or is it way too early yet.

To preface I already have a 5 year old but I have Pcos and been struggling.