Talk to Gynecologist on TTC - Bloody Discharge On 20th Day Of Cycle

hello im trying to conceive for last 6 months. on 20th day of my cycle i got bloody discharge i was waiting for periods but it cleared out after 2 days then again after some days im having this bloody discharge . today is my 29th day of cycle and on and off i get clear discharge or sometimes bloody. there is no stain on pad or anything. i did pregnancy test on 28th day but it was negative. should i wait for my periods or should i wait again for preganancy test. please guide me. is this something to worry about. its first time im facing this. im very confused.