Possible pregnancy.

Soph
Hey ladies, i have a 20 month old son atm, and ive been having symptoms of pregnancy same as i did with my son, headaches, heartburn,backache, cramping, constipation, feeling sick. My last period was 3rd march and finished on the 8th, im so unsure, havent mentioned to my bf as i duno wat to thiink. When is best to test??