Recent stomach injury, is it serious?

I fell over 2 days ago and my stomach took all the impact. Im having severe stomach pain, especially my abdomen, there is no bruising, I'm finding it hard to go to the toilet, and I'm bleeding from my vagina but I'm not sure if it's my period. The pain in getting progressively worse. Should I go to the hospital? (I'm not pregnant)

Hello , if you are in pain and worried, then I would get advice from either your doctor or ring 111. 

Are you due your period?  If the bleeding lasts five days and goes away, the bleeding is your period.  Period pain tends to get worse and worse if you don’t control it with painkillers.

The pain could also be due to the fall which can cause muscle pain.  Do you have IBS since you say you are having constipation?  If you have IBS, your periods can make IBS pain worse.  The fall, IBS (if you have it) and periods will all contribute to the pain.   Pain from the fall may take time to heal, IBS flare ups can time to calm down too.  Give it a week, if no better after this, see your doctor or go to your emergency department at the hospital.