Can't figure out how far along I am

Tara
I just had my son last September and probably a little over a month after that I got the shot...as soon as the shot wore off I switched to the bc pill. I stopped taking bc some time in April but can't remember the exact day. I started using ovulation tests and got a positive ovulation test April 30th. I took the first .88 test Friday and the other two yesterday. According to the digital I'm 3-4 weeks along I seen when I read the paper that came in the box. Does that seem right? I want to schedule and appointment but I don't want to be disappointed when I see nothing on the ultrasound because I'm to early. Does anyone have faint positives like this and how far along were you? Has anyone taken the digital and been further along then it said?
Edit*** I haven't had a period since 6 weeks after my son was born so this is why I can't figure it out for sure.