Toddler is extremely clingy

Nu

Is anyone else‘s toddler extremely clingy at the moment? My son started daycare a month ago and has been sooo clingy. Even when I‘m sitting on the toilet and can‘t hold him, he starts crying. When I‘m sitting on the couch and try to watch him play on his playmat RIGHT INFRONT of me, he starts crying cause he wants me to sit with him on the floor all day. When we go outside he’s a little more distracted, but I’m currently pregnant and nauseous all day so I can’t be outside more than 2 hours at a time. I try to comfort him as much as possible, but I only have so much energy. The thing is, he only wants ME. My mom just spent one week with us to help me out but he doesn’t accept anyone else but me. It‘s driving me nuts, please tell me this is just a phase?