The fact that you will inevitably get pregnant at exactly the point in the year which means you are unable to drink at literally LOADS of totally incredible celebrations or one off events with fantastic free booze. See: christmas, weddings, anniversary parties, big office do's, 30th birthdays....etc.
The weird mood swings in the first and second trimesters
The constant sneezing
The fact you start getting loads more hair on your stomach. wtf???
Constant (literally near constant) need to pee. It's like you go in, wee, leave the toilet, then the baby shifts position and unleashes a whole other section of your bladder that was previously cut off. 
Third trimester insomnia. You'd think nature would let you binge on sleep whilst you still can. NOPE.
Yes to increased skin tags - especially in bizarre places. I hope they go away afterwards?
How fucking amazing ultrasounds are. Even if you don't get/understand the over excitable american reaction of bursting into tears the second a fuzzy blob comes on screen, it's still literally the coolest experience ever. Technology is incredible.