IVF meds.... Quick question!

Corinne • leow👮🏻‍♂️ IVF💗👶🏻 09.03.2016 natural💗👶🏻 due 03.27.2019
Hey y'all,
So we start our <a href="https://glowing.com/glow-fertility-program">IVF</a> meds last night. When we did them, I got a big bruise on my stomach and a hard bump. The bump went away by today but it's still pretty bruised. 
I took my injections again tonight on the opposite side, but there was no lump or bruise afterwards. I'm afraid I did it wrong tonight and I'm freaking out! 
Is it normal to bruise once and not again?
Thanks!