Woke up with random lower back pain?🤕😪

So I’m 18 weeks and some change pregnant and I took a nap at around 3pm and woke up about an hour and a half later with this awful lower back pain! I’m not immobile nor am I bleeding or nauseous, the pain is just still there!! I do have some mild cramps and a little pain on both sides of my waist as well. I also just finished up a round of antibiotics for BV. Is all of this normal? Is my body just stretching? Should I be concerned especially since I’ve just recently had BV? 😖🤕😫