Do you think I’d be good to take a test?

So me and my boyfriend haven’t been trying but if it happens it’s not the worst thing in the world.

But we had unprotected sex 4/11-4/15 and about 4 different times since then but I had a little bit of blood on my underwear 4/18 it wasn’t period blood since I got off my period on 4/12 and it was kinda light but some was like a rust color.

I’ve also been peeing a lot more, depending on the food I feel sick when I eat it, I’ve been having a lot of back pain and I feel like my boobs are starting to get heavier because my bras aren’t fitting right.

Ive never spotted in my life so I was just wondering if it would be to early to test but I’m supposed to get my period 5/5-5/9