what could it be?!

So I started taking Zoloft a week ago for PPD(I'm feeling much better) but I have been having all these weird symptoms. like last night before bed I noticed a white circle on my stomach that was bigger than a quarter (gone this morning). I also have been really crampy the past three days and noticed I have a few bruises. idk if the white spot just freaked me out and I'm reading into it or what. I also feel like my left side by my hip is bruised, it's so sore! I also woke up the past two days feeling nauseated. Anyone experience anything like this before? what do you all think?!