Test progression

Hey everyone! So this is my third pregnancy im supposed to be due nov 28th which would make me 8 weeks 1 day my last period was feb 22nd till the 28th i missed march period which was due the 22nd of March tested march 30th negative tested april 4th negative tested again april 14th and its positive but i think i may have ovulated later which is causing me confusion to how far along i am i went in for blood work 4 days ago and my hcg was 831 which placed me at around 5 weeks based off of charts no gestational sac was found so i was scheduled for an ultrasound yesterday and still nothing i went back in today to get bloodwork but won’t find out the number for a little bit im taking tests to see if the line is progressing and it looks like it is.. today is almost a dye stealer the test line is obviously darker than the control line but has anyone else been through this?

Tests are in order from the last 3 days top by my fingers would be the first one bottom would be from this morning