Unknown spot

Hi po. 22weeks & 4days pregnant po ako. Before po ako umihi, i saw an unidentified spot sa panty ko. Parang 25cent lang naman kalaki na dot na parang color red. Hindi po ako sure if blood. So i was so worried. Then may discharge po ako na white. Pag wipe ko po wala namang dark colored fluid. Is it okay po or do i need to ask my ob? 1st pregnancy po eh. Thank you po sa makasagot.