Advice please!

Ive been ttc since November and i just can’t seem to get pregnant. My periods are very irrgalur so it’s hard to track ovulation. But last Wednesday I took an ovulation test and got the blinking smiley face.. I took another test everyday since then and it’s still a blinking smiley face.. obviously we bd as soon as we saw that smiley face but I never got a solid smiley face. I’m becoming discouraged but then this morning I woke up and it looked like I started my period but after my second pee of the day the blood was completely gone and now I kinda just have back cramps.. could this possible be implantation bleeding? It seems that I only bleed in the am and after i pee first thing in the morning, I don’t bleed the rest of the day! I’m crampy today too so i don’t know what to think! Any advice would be greatly appreciated!