Could i be pregnant? i've missed my period for almost a month and have all the symptoms! and i've been pregnant before.i took 3 first response tests that came back negative! could i still be pregnant?

Yes, : Yes, you could still be pregnant. If you took the pregnancy tests early on and within relatively brief intervals, the HCG levels may have been too low for a home pregnancy test to detect. However, if you waited a week after your missed period to take the test and this was followed by repeat tests at intervals of a week or longer, than you may wish to talk to your ob/ gyn doctor. Your doctor can order a pregnancy blood test.