Has anyone been pregnant, in the first couple of months and still had periods?

I was 4 months pregnant 14 years ago but didnt kow it until 4 months later because I still had my period. Has anyone else experianced ths? I missed my period 3 months ago,took a home preganct test and it said I was again. the next month I had a period but way late. I have been having periods for the last 3 months., just took another test and it was a red line with a pink slight line. was about 2 weeks late just started bleeding like a period again. but my question is..I have been through this before when i was pregnant and bled through the first 4 months like a period and still was pregnant. has anyone been through this?