Had chemical last month clots blood down legs etc sorry for tmi but was negative tests as doc said test in 2 weeks to confirm if stil pregnant

Period due 22 did not arrive so would make it nearly 3 weeks late lines not getting darker on tests very faint but first response is brighter line shows in a few seconds ive had no cramps or pain but around 1.30 pm today started light bleeding noticed drops in toilet red blood 🩸 now getting lighter coloured and flow not enough fill pads etc , i am unsure as certain i did not miscarry but does any one know what ir can be and why test lines are faint? Testing again sunday as will be 3 weeks late then bit daunting to be honest got hopes up now worried if something is wrong or ectopic etc :( will speak doctor tomoz