Can u get a normal period if pregnant, nd have an irregular one?

I had my period june 11th - june 19 th my normal cycle. I had unprotected sex wit my bf june 8th nd 9th before it came. After my period ended on the 19th I had unprotected sex again during my fertile days on the 23rd nd 24th. On the 26th ( my supposibly ovulation day ) I was spottn brownish redish. Nd today the 27th Its more blood wen I use the restroom nd wipe myself. I personally believe I cnt have children, ive been tryn for a while, never no signs of pregnancy