I had a medical abortion in feb. bleeding stopped on feb 27th. when should i expect my next period? and if i have sex before my period comes and would like to take a preg test will i have false positive result because of hormones still being there?

Your next menses may not occur until up to 6 weeks post abortion medical procedure. Yes, there may still be a positive pregnancy test from residual hCG hormones still present. Have you been cleared for sexual activity by the Abortion MD/clinic? if not please do so first and use contraception when you do re-engage intercourse to avoid a "oops" pregnancy.