Sex and a sore back, need your opinions 😷

Yardy • I love being a woman!!🍾🎉
I'm new to having sex and last night was the fourth time I've had sex ever 
We did it like 4 times yesterday and for about 40 mins - an hour long, he was also going really hard and rough and then after we had sex I started to feel very dizzy and faint, is that normal?
And then I woke up today with a really sore back and I'm not sure if it was from all the sex we had and that I'm not use to it or that my period is due in a day ??? 
What do you guys think?