My period is late 4 weeks today

Last period was january 12th and we last BD on jan 30th (he works away alot)

On day last period should have been due Feb 15th - i got faint BFPs (squinters) for about a week and then a two day bleed with spotting a day either side, doc said probably chemical pregnancy as tests didnt get any darker and to test a week after it stopped.

Tested 8 days after the bleed and got a proper positive and with same urine and hpt brand a lighter positive but still seeable did another and it was positive again. Did next day with fmu and positive again! 

Was sure i was pregnant then, called EPU booked in for early scan thinking i was 8wks aftually would have been 6 as miscalculated - they wanted me to do urine test before scan and it was negative so they never scanned me & sent me home :( went to my Gp got bloods done and a few days later results were negative. Glow says id only be 8wks+2 today and still having symptoms but stronger than before, no AF & pain on my left side now and again. Its so weird! My GP has booked me for ultrasound after internally and externally examining me and said to keep taking dolic acid and eating well & ill get apportionment for scan in post :/ no idea whats going on :(