MJ would be heartbroken. She would try to be strong in front of Peter, but inside she'd be a mess. She might use their shared love of things like photography or theater to try and trigger his memory. She would also be very protective of him, not wanting any harm to come to him in his vulnerable state.
His friends would be very worried. For example, Ned would probably be constantly by his side, trying to find ways to help him remember. He might show Peter old photos or talk about their shared memories.
Peter might be initially suspicious. After all, in his world, strange things often mean trouble. But then he could also be curious to find out more about this doppelganger. He might try to test the doppelganger's abilities, like seeing if they have the same spider - sense. If the doppelganger seems friendly, Peter could start to form a bond with them, sharing stories about their lives and learning from each other.
The media would probably go wild. There would be headlines everywhere. Some media outlets might portray him as a savior, while others might try to dig up dirt on him or question his motives for hiding his identity for so long.
Peter will probably be very confused at first. He's used to being part of the team, and suddenly being hunted by them is a huge shock. He might try to talk to them to clear up any misunderstandings.
Their friends like Ned would probably be really excited at first. He might start making plans for the baby shower right away and offer all kinds of support, like helping them find a bigger apartment. As for Peter's aunt May, she would be overjoyed but also a bit worried. She would give MJ lots of advice on taking care of herself during the pregnancy.
His friends might find Peter's newfound Superman obsession a bit strange at first. For example, Ned might be a bit confused when Peter starts talking non - stop about Superman's feats. But as time goes on, they could become more understanding. MJ might even be interested in the whole Superman concept through Peter's enthusiasm and start to see Peter in a new light, like he's not just the neighborhood Spider - Man but also has this big - dreamer side to him.
The Avengers would initially be in shock when they find out Peter is sick. Clint Barton would be the one to keep a calm head and start organizing things. Wanda Maximoff would try to use her powers to ease Peter's pain if possible. Vision would use his vast knowledge to try and find a solution. They would all be very concerned and do everything they can to make Peter better, from getting the best medical help to providing a safe and comfortable environment for him to recover.
Some Avengers might be initially skeptical. Thor, for example, might not understand the power of a 'spider - boy' at first. But others like Captain America would probably see his potential and welcome him. Black Widow might be intrigued by his skills and try to train him further in espionage - related aspects.
Well, at first, some of his co - workers might be intimidated by him. They know he has superpowers and they might be worried that he could be a bit of a loose cannon in the workplace. But as they get to know him, they'd realize that Peter is just a normal, albeit very talented, guy. The scientists at Stark Industries would be especially interested in his unique physiology. They might want to study him, which could make Peter a bit uncomfortable at times. And then there are the administrative staff. They might be more concerned with how Peter's superhero activities could affect the company's public image and insurance policies, but once they see how responsible he is, they would warm up to him.
Their friends would probably be really excited. Harry, for example, might be a bit jealous at first but then become the baby's cool uncle. Aunt May would be over the moon and would offer lots of help and advice on raising the baby.
Some of his minor enemies might see this as an opportunity to strike. They could think that a sick Peter Parker is an easy target. For example, Flash Thompson might try to bully him more than usual, not knowing that even sick, Peter has his powers.