HELP was I pregnant before?

Georgia

HELP .... guys I need advise on what you think.. this is a picture of a very faint positive I got on the 18th Jan. My last 4 day period was 23rd of December, on the 19th Jan I had a heavy bleed for around 8 hours so I put it down to a misscarrage and carried on with myself as usual. After not bleeding since the 19th of Jan and also feeling very sickly and struggling staying awake with my 10 month old daughter I decided to take a test, and within a few seconds appears 2 very dark lines! My next period is not due untill tomorrow? Has anyone had this? I've called my midwife and she has measured me around 10 weeks and has given me a number to book a dating scan wich I will do tomorrow as it's too late now, do you guys think I'm pregnant from the first FP or have possibly conceived after? If the answer is conceived after foes anyone have any idea why the lines are so dark? I'm going out of my mind I have posted both tests. The first is difficult to see so I'm sorry.