infection or ovulation
Since you had your period on XXXXXXX 1st, possibility of pregnancy
can be surely ruled out.Lower abdominal pain
with some spotting can occur mid cycle, due to infections like UTI, vaginal infection
or ovulation. In your case, i would first rule out infection. Masturbation
can often be an accessory to infection. If its ovulation pain, there may some light spotting also, but it only lasts a day or two. You need to wait and watch for another day. If you stop bleeding, its quite possibly ovulation pain. If it continues, then likely, the cause is hormonal
imbalance and needs to be investigated further. Meanwhile, drink plenty of water and clear fluids to flush out infection. Keep the area clean. Wash only with water, esp after using the toilet.