What am I supposed to do😣

I really need some advice or help from other ladies, I normally have a 28-30 day cycle. I’m not sure when I ovulate as I don’t take the opks or bbt or look for cm, I just have sex lol. Anyway my last period was 1st March and finished on the 6th March. I was meant to start my period on the 26th-30th March and I still haven’t. I have taken a test (wasnt with fmu or concentrated urine) and had a red faint line appear in the box. Everyone said it was immediately a positive. So I took the same brand test the morning after and it was negative. I thought I’d just sit tight and wait patiently for af to arrive but she still hasn’t. I’m never normally this late so I’m quite scared, we are ttc and have been for 9 months. I haven’t even had any symptoms really of pregnancy or af so I can’t tell what’s going on! I have been spotting pink after sex but it isn’t a lot of blood it’s just dotty on the toilet paper after I wipe and that’s it. I’m only spotting after sex. Please can someone give me some advice? I don’t know what to do at this point. 😔