I'm seriously freaking out

Melodie
Had our egg retrieval on 7/28 and found out we are pregnant on 8/8. As of Weds my HCG is 258.Since Sunday I've been spotting dark blood and cramping sporadically . Yesterday the spotting was heavier and mild cramps continued. Today no cramps but heavier blood. This is my first pregnancy and our first round with <a href="https://glowing.com/glow-fertility-program">IVF</a>. Is this normal? I'm really worried.