Why am I constipated all of a sudden ?

So my AF isn’t supposed to come for 2 more weeks . Last 5 days I’ve been running to toilet more often ( to pee ) , my lower back hurts , my front ( around ovaries) hurts . And the last 3 or 4 days I’ve been constipated. I’ve been to toilet twice those 4 days , and it’s just a little bit coming out with a lot of pushing . ( sorry ) . Normally , as it has always been, I don’t really have hard poo . I do it every morning , and sometimes in the middle of day too. What’s happening ? Could it be because I started taking Folic acid recently ?

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