Ovulation and when to BD?

My cycle is 31-35 days and i'm meant to ovulate between the 19th and the 24th of may, but i have been spotting form the 6th may to today (al tho it has not been there the last few visits to the toilet) should i just act as tho i will still be ovulating and BD with my hubby? I am using OPK's Thanks for you help and and baby dust all round :-)