My midwife told me you can spot from straining ...like bm's or lifting heavy stuff
If it's from your anus it is most likely a ruptured hemorrhoid. This happens and can be a little painful. If the blood is from your vagina, you should call. Since pregnancy brings on constipation, some strain on the bowels is expected (and necessary if you're not taking a stool softener) as laxatives are not recommended during pregnancy.
if ur vaginally spotting u should call ur doctor by straining u could actually miscarry
If you actually had a productive bm after the straining then it maybe from hemroids and not from your va jj. It happens to me sometimes