I'm kind of going out of my mind right now. so i got a faint line last Thursday

then Saturday (2 days ago) I had some spotting that went on to last night. I'm not sure when I was due on glo said last Wednesday but my calculations are yesterday. I phoned out of hours on sat and they said they couldn't do anything and wait as I'm only 4 weeks. today I tested again top one fmu bottom afternoon not really a hold. would you say the test would be negative if I had a chemical?

going in for bloods on Wednesday and Friday but just so worried x