Is it normal to have a sore back day after sex?

So my husband and I had some good sex twice yesterday and honestly it’s been awhile lol. We have a toddler and I’m pregnant.

After the first time my back was a little sore. But I was still able to go out, bend over, walk, etc. Then after the second time (which was at night) my back was still sore. He gave me a massage and we went to bed.

Since this morning the middle of my back has been really sore (feels almost bruised whenever I touch the sore area or I bend over). I’m wondering if he just put too much pressure on me? We did it from the back both times and doggy style as well.

Should I be concerned at all? Is this normal? I can’t remember if this has ever happened to me before.