Advice please 😔

Charlie
Had one depo injection back in Nov it ran out 29th Jan 16. Decided TTC. Bled one day in March red blood, day after had brown like it was the end of a period since then had nothing. I did a pregnancy test just 3 weeks ago came back a very faint positive did one the day after in the morning was negative. Had sore boobs for 2 weeks then that stopped. Did another test Wednesday evening same again very faint line.  Yesterday <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> and today I've had some pain (not harsh pain) more like twinges or a sharp pain in my right and side low towards my pubic area. I have a doctors appointment next Friday for some advice. Anyone had anything like this before? I'm worrying and have concerns. Thank you all x