I need advice!

So I had a weird period last month which made me think I could be pregnant.. it started out really light and really pink, full period came but I had NO cramps, no back ache no nothing which I usually have a week before my period and then quite badly the week of my period... once it came to the last day the blood (sorry tmi) was a blackish colour which was really odd.

The day after me and oh had sex and then again this morning.

Now I’ve been having weird symptoms for ages, feeling full 24/7 and then all the sudden absolutely starving, stuffy blocked nose, lower back pain (period isn’t due for 3 weeks), completely put off certain foods, irritable& grumpy, major mood swings& shattered all the time. This morning I also had extreme heartburn before I’d even eaten anything.

Can anyone advise what might be going on? I obviously want to be pregnant but it hasn’t seemed to happen yet this time around (already have a 2 year old with oh)

I don’t want to waste tests, I don’t want to be disappointed I just want to know what the heck’s going on lol.

Thanks!