31 weeks pregnant and I suddenly feel amazing?

I’m a FTM and this pregnancy has been difficult to say the least. As soon as I hit late second trimester I started experiencing sciatica pain, pubic symphysis pain and a host of other things. Not to mention the third trimester exhaustion hit me HARD.

Basically, I’ve been miserable - until yesterday. While I feel like I should be celebrating I’m slightly concerned. The day before yesterday I had a lot of pain throughout my body and could barely keep my head up straight. I was experiencing bad braxton hicks and also round ligament pain. But then yesterday I woke up with a ton of energy, body pain had disappeared and I feel like my pre-pregnant self. I haven’t felt this good all pregnancy. Bub seems to be okay because she’s kicking and moving around, but I can’t help but think that maybe something is wrong? Every time I call the midwife hotline they tell me it’s normal, so I wanted to know if anyone else experienced something like this at 31 weeks?