Sex and pregnancy

So idk what has happened but suddenly all I was is sex so my fiance and I have had sex at least 2x everyday for the past 5 days...

Explanation: 1st Tri. I had no sex drive mostly because being sick and all is gross lol. 2nd tri. I had a little bit of sex drive very rarely but everytime we did try it hurt so bad we just stopped like 2 minutes in. Like it felt as if my vagina had changed shape, like it was more tight and idk how else to explain that part. But now it like changed suddenly within a week my sex drive went through the roof and my vagina doesn't hurt anymore... idk what happened and I'm definitely not complaining but I was just confused lol. Anywho this was just a rant... but has this happened to anyone else? IK I'm not the only one.