Yes. Harry is pregnant.

She still had not given the bottle back to Madam Pomfrey that the matron was already using charms to find the basics of the transformation and, eventually a cure. As she used a basic charm that highlighted the different compounds found in the urine, a bright pink color flashed from the bottle, making Poppy Pomfrey shout:

"MERLIN'S BEARD! Don't you know how to use contraception!? Spermicidum should be taught in first year, Professor Dumbledore!", she said before storming out of the infirmary, "I'll get the father!"

The surprise made Harry drop the bottle, which was thankfully caught by Dumbledore's quick reflex on using Wingardium Leviosa on it before it broke on the ground and bringing it back to the counter safely.

"I guess congratulations are in order to you and Mr. Weasley. You have not lost any time before coming back to school, as far as I can see", said the headmaster with a chuckle under his breath.

Harry was frozen, a hand on her belly. It hadn't been hours since she had had her first time and she was already carrying a someone's child. All she had ever wanted was to find out how it felt to be on the other side... She didn't want that..! Ron's child!?