How bad is this?

Long story short I missed taking my shots for 3-4 weeks because i genuinely just forgot and was going through a chaotic month and now I have spotting and my stomach hurts a little. Like an annoying sharp pain that won’t go away. I had just done a shot a few days before this started and then freaked out last night when I noticed and did another shot. I’ve never dealt with this at all and was definitely a wake up call to not be a lazy POS. But how long does this last? The stomach thing is the worst part because it’s just annoying. The spotting isnt that bad only can see a tiny bit of blood when wiping but of course I’d 100% rather not have any at all. Yes I realize how stupid it is to miss an entire month of shots, here for advice not your opinions on my stupidity.